Region scrollbar fix!

Now scrollbars correctly hide and show, making space for the actual contents
in a region. It solves several old hacks, and puts view2d code a bit more
back in control as well. 

Implementation notes:

- The view2d mask feature is working again
- The #define V2D_SCROLL_HORIZONTAL_HIDE means: "turn on hiding".
- Code for UI_view2d_region_reinit() is enforcing better standard view settings

But... two hack/patches needed to be added:

- Region panel drawing: if after generating the button panels it appears
  a scroller hides or reveils, it calls all the generating code again.
  (a simple scale doesn't work due to rounding differences in layout code)

- View2d code that maps 'tot' and 'cur' rects: if this code detects that
  the mask changes, it calcs the map code again.

Also a bugfix (issue in 2.65)

- The left/bottom area split widget was drawing 1 pixel too large sometimes, 
  leaving bad trails on moving area dividers.

19 files changed, 463 insertions, 435 deletions

diff --git a/source/blender/blenloader/intern/versioning_250.c b/source/blender/blenloader/intern/versioning_250.c
index 1521739258e..f4d841fd22a 100644
--- a/source/blender/blenloader/intern/versioning_250.c
+++ b/source/blender/blenloader/intern/versioning_250.c
@@ -292,7 +292,7 @@ static void area_add_window_regions(ScrArea *sa, SpaceLink *sl, ListBase *lb)
 					memcpy(&ar->v2d, &soops->v2d, sizeof(View2D));
 
 					ar->v2d.scroll &= ~V2D_SCROLL_LEFT;
-					ar->v2d.scroll |= (V2D_SCROLL_RIGHT|V2D_SCROLL_BOTTOM_O);
+					ar->v2d.scroll |= (V2D_SCROLL_RIGHT|V2D_SCROLL_BOTTOM);
 					ar->v2d.align = (V2D_ALIGN_NO_NEG_X|V2D_ALIGN_NO_POS_Y);
 					ar->v2d.keepzoom |= (V2D_LOCKZOOM_X|V2D_LOCKZOOM_Y|V2D_KEEPASPECT);
 					ar->v2d.keeptot = V2D_KEEPTOT_STRICT;
@@ -415,7 +415,7 @@ static void area_add_window_regions(ScrArea *sa, SpaceLink *sl, ListBase *lb)
 					ar->v2d.tot.ymax = ar->winy;
 					ar->v2d.cur = ar->v2d.tot;
 					ar->regiontype = RGN_TYPE_WINDOW;
-					ar->v2d.scroll = (V2D_SCROLL_RIGHT|V2D_SCROLL_BOTTOM_O);
+					ar->v2d.scroll = (V2D_SCROLL_RIGHT|V2D_SCROLL_BOTTOM);
 					ar->v2d.align = (V2D_ALIGN_NO_NEG_X|V2D_ALIGN_NO_POS_Y);
 					ar->v2d.keepzoom = (V2D_LOCKZOOM_X|V2D_LOCKZOOM_Y|V2D_LIMITZOOM|V2D_KEEPASPECT);
 					break;
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index 90f8779b2c7..9a04138e72e 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -658,6 +658,7 @@ void uiDrawPanels(const struct bContext *C, struct ARegion *ar);
 
 struct Panel *uiBeginPanel(struct ScrArea *sa, struct ARegion *ar, uiBlock *block, struct PanelType *pt, int *open);
 void uiEndPanel(uiBlock *block, int width, int height);
+void uiScalePanels(struct ARegion *ar, float new_width);
 
 /* Handlers
  *
diff --git a/source/blender/editors/include/UI_view2d.h b/source/blender/editors/include/UI_view2d.h
index 3ae1e93dc3d..81a0f526049 100644
--- a/source/blender/editors/include/UI_view2d.h
+++ b/source/blender/editors/include/UI_view2d.h
@@ -148,7 +148,6 @@ typedef struct View2DScrollers View2DScrollers;
 void UI_view2d_region_reinit(struct View2D *v2d, short type, int winx, int winy);
 
 void UI_view2d_curRect_validate(struct View2D *v2d);
-void UI_view2d_curRect_validate_resize(struct View2D *v2d, int resize);
 void UI_view2d_curRect_reset(struct View2D *v2d);
 void UI_view2d_sync(struct bScreen *screen, struct ScrArea *sa, struct View2D *v2dcur, int flag);
 
diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index 25f85883d9c..1d26cbd344b 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -2666,6 +2666,8 @@ static uiBut *ui_def_but(uiBlock *block, int type, int retval, const char *str,
 	
 	/* we could do some more error checks here */
 	if ((type & BUTTYPE) == LABEL) {
+		if ((poin != NULL || min != 0.0f || max != 0.0f || (a1 == 0.0f && a2 != 0.0f) || (a1 != 0.0f && a1 != 1.0f)))
+			printf("blah\n");
 		BLI_assert((poin != NULL || min != 0.0f || max != 0.0f || (a1 == 0.0f && a2 != 0.0f) || (a1 != 0.0f && a1 != 1.0f)) == FALSE);
 	}
 
diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index 958334fb476..9988224e0ab 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -5248,32 +5248,15 @@ static int ui_mouse_inside_region(ARegion *ar, int x, int y)
 	 */
 	if (ar->v2d.mask.xmin != ar->v2d.mask.xmax) {
 		View2D *v2d = &ar->v2d;
-		rcti mask_rct;
 		int mx, my;
 		
 		/* convert window coordinates to region coordinates */
 		mx = x;
 		my = y;
 		ui_window_to_region(ar, &mx, &my);
-		
-		/* make a copy of the mask rect, and tweak accordingly for hidden scrollbars */
-		mask_rct = v2d->mask;
-		
-		if (v2d->scroll & (V2D_SCROLL_VERTICAL_HIDE | V2D_SCROLL_VERTICAL_FULLR)) {
-			if (v2d->scroll & V2D_SCROLL_LEFT)
-				mask_rct.xmin = v2d->vert.xmin;
-			else if (v2d->scroll & V2D_SCROLL_RIGHT)
-				mask_rct.xmax = v2d->vert.xmax;
-		}
-		if (v2d->scroll & (V2D_SCROLL_HORIZONTAL_HIDE | V2D_SCROLL_HORIZONTAL_FULLR)) {
-			if (v2d->scroll & (V2D_SCROLL_BOTTOM | V2D_SCROLL_BOTTOM_O))
-				mask_rct.ymin = v2d->hor.ymin;
-			else if (v2d->scroll & V2D_SCROLL_TOP)
-				mask_rct.ymax = v2d->hor.ymax;
-		}
-		
+
 		/* check if in the rect */
-		if (!BLI_rcti_isect_pt(&mask_rct, mx, my)) 
+		if (!BLI_rcti_isect_pt(&v2d->mask, mx, my))
 			return 0;
 	}
 	
diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.c
index 5b6a609e4d2..9fbf2fe8898 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.c
@@ -112,7 +112,7 @@ static int panel_aligned(ScrArea *sa, ARegion *ar)
 	else if (sa->spacetype == SPACE_FILE && ar->regiontype == RGN_TYPE_CHANNELS)
 		return BUT_VERTICAL;
 	else if (sa->spacetype == SPACE_IMAGE && ar->regiontype == RGN_TYPE_PREVIEW)
-		return BUT_VERTICAL; 
+		return BUT_VERTICAL;
 	else if (ELEM3(ar->regiontype, RGN_TYPE_UI, RGN_TYPE_TOOLS, RGN_TYPE_TOOL_PROPS))
 		return BUT_VERTICAL;
 	
@@ -812,8 +812,8 @@ static void ui_panels_size(ScrArea *sa, ARegion *ar, int *x, int *y)
 {
 	Panel *pa;
 	int align = panel_aligned(sa, ar);
-	int sizex = UI_PANEL_WIDTH;
-	int sizey = UI_PANEL_WIDTH;
+	int sizex = 0;
+	int sizey = 0;
 
 	/* compute size taken up by panels, for setting in view2d */
 	for (pa = ar->panels.first; pa; pa = pa->next) {
@@ -834,6 +834,11 @@ static void ui_panels_size(ScrArea *sa, ARegion *ar, int *x, int *y)
 		}
 	}
 
+	if (sizex == 0)
+		sizex = UI_PANEL_WIDTH;
+	if (sizey == 0)
+		sizey = -UI_PANEL_WIDTH;
+	
 	*x = sizex;
 	*y = sizey;
 }
@@ -956,6 +961,25 @@ void uiDrawPanels(const bContext *C, ARegion *ar)
 	}
 }
 
+void uiScalePanels(ARegion *ar, float new_width)
+{
+	uiBlock *block;
+	uiBut *but;
+	
+	for (block = ar->uiblocks.first; block; block = block->next) {
+		if (block->panel) {
+			float fac = new_width / (float)block->panel->sizex;
+			printf("scaled %f\n", fac);
+			block->panel->sizex = new_width;
+			
+			for (but = block->buttons.first; but; but = but->next) {
+				but->rect.xmin *= fac;
+				but->rect.xmax *= fac;
+			}
+		}
+	}
+}
+
 /* ------------ panel merging ---------------- */
 
 static void check_panel_overlap(ARegion *ar, Panel *panel)
diff --git a/source/blender/editors/interface/view2d.c b/source/blender/editors/interface/view2d.c
index 190d90b3c36..d0d631e14a5 100644
--- a/source/blender/editors/interface/view2d.c
+++ b/source/blender/editors/interface/view2d.c
@@ -60,6 +60,8 @@
 
 #include "interface_intern.h"
 
+static void ui_view2d_curRect_validate_resize(View2D *v2d, int resize, int mask_scrollers);
+
 /* *********************************************************************** */
 
 /* XXX still unresolved: scrolls hide/unhide vs region mask handling */
@@ -73,15 +75,15 @@
  */
 static int view2d_scroll_mapped(int scroll)
 {
-	if (scroll & V2D_SCROLL_HORIZONTAL_HIDE)
+	if (scroll & V2D_SCROLL_HORIZONTAL_FULLR)
 		scroll &= ~(V2D_SCROLL_HORIZONTAL);
-	if (scroll & V2D_SCROLL_VERTICAL_HIDE)
+	if (scroll & V2D_SCROLL_VERTICAL_FULLR)
 		scroll &= ~(V2D_SCROLL_VERTICAL);
 	return scroll;
 }
 
 /* called each time cur changes, to dynamically update masks */
-static void view2d_masks(View2D *v2d)
+static void view2d_masks(View2D *v2d, int check_scrollers)
 {
 	int scroll;
 	
@@ -90,19 +92,26 @@ static void view2d_masks(View2D *v2d)
 	v2d->mask.xmax = v2d->winx - 1; /* -1 yes! masks are pixels */
 	v2d->mask.ymax = v2d->winy - 1;
 
-#if 0
-	/* XXX see above */
-	v2d->scroll &= ~(V2D_SCROLL_HORIZONTAL_HIDE | V2D_SCROLL_VERTICAL_HIDE);
-	/* check size if: */
-	if (v2d->scroll & V2D_SCROLL_HORIZONTAL)
-		if (!(v2d->scroll & V2D_SCROLL_SCALE_HORIZONTAL))
-			if (BLI_rctf_size_x(&v2d->tot) <= BLI_rcti_size_x(&v2d->cur))
-				v2d->scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
-	if (v2d->scroll & V2D_SCROLL_VERTICAL)
-		if (!(v2d->scroll & V2D_SCROLL_SCALE_VERTICAL))
-			if (BLI_rctf_size_y(&v2d->tot) <= BLI_rctf_size_y(&v2d->cur))
-				v2d->scroll |= V2D_SCROLL_VERTICAL_HIDE;
-#endif
+	if (check_scrollers) {
+		/* check size if hiding flag is set: */
+		if (v2d->scroll & V2D_SCROLL_HORIZONTAL_HIDE) {
+			if (!(v2d->scroll & V2D_SCROLL_SCALE_HORIZONTAL)) {
+				if (BLI_rctf_size_x(&v2d->tot) > BLI_rctf_size_x(&v2d->cur))
+					v2d->scroll &= ~V2D_SCROLL_HORIZONTAL_FULLR;
+				else
+					v2d->scroll |= V2D_SCROLL_HORIZONTAL_FULLR;
+			}
+		}
+		if (v2d->scroll & V2D_SCROLL_VERTICAL_HIDE) {
+			if (!(v2d->scroll & V2D_SCROLL_SCALE_VERTICAL)) {
+				if (BLI_rctf_size_y(&v2d->tot) + 0.01f > BLI_rctf_size_y(&v2d->cur))
+					v2d->scroll &= ~V2D_SCROLL_VERTICAL_FULLR;
+				else
+					v2d->scroll |= V2D_SCROLL_VERTICAL_FULLR;
+			}
+		}
+	}
+	
 	scroll = view2d_scroll_mapped(v2d->scroll);
 	
 	/* scrollers shrink mask area, but should be based off regionsize 
@@ -126,8 +135,8 @@ static void view2d_masks(View2D *v2d)
 		}
 		
 		/* horizontal scroller */
-		if (scroll & (V2D_SCROLL_BOTTOM | V2D_SCROLL_BOTTOM_O)) {
-			/* on bottom edge of region (V2D_SCROLL_BOTTOM_O is outliner, the other is for standard) */
+		if (scroll & (V2D_SCROLL_BOTTOM)) {
+			/* on bottom edge of region */
 			v2d->hor = v2d->mask;
 			v2d->hor.ymax = V2D_SCROLL_HEIGHT;
 			v2d->mask.ymin = v2d->hor.ymax + 1;
@@ -142,8 +151,8 @@ static void view2d_masks(View2D *v2d)
 		/* adjust vertical scroller if there's a horizontal scroller, to leave corner free */
 		if (scroll & V2D_SCROLL_VERTICAL) {
 			/* just set y min/max for vertical scroller to y min/max of mask as appropriate */
-			if (scroll & (V2D_SCROLL_BOTTOM | V2D_SCROLL_BOTTOM_O)) {
-				/* on bottom edge of region (V2D_SCROLL_BOTTOM_O is outliner, the other is for standard) */
+			if (scroll & (V2D_SCROLL_BOTTOM)) {
+				/* on bottom edge of region */
 				v2d->vert.ymin = v2d->mask.ymin;
 			}
 			else if (scroll & V2D_SCROLL_TOP) {
@@ -152,7 +161,6 @@ static void view2d_masks(View2D *v2d)
 			}
 		}
 	}
-	
 }
 
 /* Refresh and Validation */
@@ -165,163 +173,173 @@ static void view2d_masks(View2D *v2d)
  */
 void UI_view2d_region_reinit(View2D *v2d, short type, int winx, int winy)
 {
-	short tot_changed = 0, init = 0;
+	short tot_changed = 0, do_init;
 	uiStyle *style = UI_GetStyle();
 
-	/* initialize data if there is a need for such */
-	if ((v2d->flag & V2D_IS_INITIALISED) == 0) {
-		/* set initialized flag so that View2D doesn't get reinitialised next time again */
-		v2d->flag |= V2D_IS_INITIALISED;
-
-		init = 1;
+	do_init = (v2d->flag & V2D_IS_INITIALISED) == 0;
 		
-		/* see eView2D_CommonViewTypes in UI_view2d.h for available view presets */
-		switch (type) {
-			/* 'standard view' - optimum setup for 'standard' view behavior,
-			 *  that should be used new views as basis for their
-			 *  own unique View2D settings, which should be used instead of this in most cases...
+	/* see eView2D_CommonViewTypes in UI_view2d.h for available view presets */
+	switch (type) {
+		/* 'standard view' - optimum setup for 'standard' view behavior,
+		 *  that should be used new views as basis for their
+		 *  own unique View2D settings, which should be used instead of this in most cases...
+		 */
+		case V2D_COMMONVIEW_STANDARD:
+		{
+			/* for now, aspect ratio should be maintained, and zoom is clamped within sane default limits */
+			v2d->keepzoom = (V2D_KEEPASPECT | V2D_LIMITZOOM);
+			v2d->minzoom = 0.01f;
+			v2d->maxzoom = 1000.0f;
+			
+			/* tot rect and cur should be same size, and aligned using 'standard' OpenGL coordinates for now 
+			 *	- region can resize 'tot' later to fit other data
+			 *	- keeptot is only within bounds, as strict locking is not that critical
+			 *	- view is aligned for (0,0) -> (winx-1, winy-1) setup
 			 */
-			case V2D_COMMONVIEW_STANDARD:
-			{
-				/* for now, aspect ratio should be maintained, and zoom is clamped within sane default limits */
-				v2d->keepzoom = (V2D_KEEPASPECT | V2D_LIMITZOOM);
-				v2d->minzoom = 0.01f;
-				v2d->maxzoom = 1000.0f;
-				
-				/* tot rect and cur should be same size, and aligned using 'standard' OpenGL coordinates for now 
-				 *	- region can resize 'tot' later to fit other data
-				 *	- keeptot is only within bounds, as strict locking is not that critical
-				 *	- view is aligned for (0,0) -> (winx-1, winy-1) setup
-				 */
-				v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
-				v2d->keeptot = V2D_KEEPTOT_BOUNDS;
-				
+			v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
+			v2d->keeptot = V2D_KEEPTOT_BOUNDS;
+			
+			if (do_init) {
 				v2d->tot.xmin = v2d->tot.ymin = 0.0f;
 				v2d->tot.xmax = (float)(winx - 1);
 				v2d->tot.ymax = (float)(winy - 1);
 				
 				v2d->cur = v2d->tot;
-				
-				/* scrollers - should we have these by default? */
-				/* XXX for now, we don't override this, or set it either! */
 			}
-			break;
+			/* scrollers - should we have these by default? */
+			/* XXX for now, we don't override this, or set it either! */
+		}
+		break;
+		
+		/* 'list/channel view' - zoom, aspect ratio, and alignment restrictions are set here */
+		case V2D_COMMONVIEW_LIST:
+		{
+			/* zoom + aspect ratio are locked */
+			v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
+			v2d->minzoom = v2d->maxzoom = 1.0f;
 			
-			/* 'list/channel view' - zoom, aspect ratio, and alignment restrictions are set here */
-			case V2D_COMMONVIEW_LIST:
-			{
-				/* zoom + aspect ratio are locked */
-				v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
-				v2d->minzoom = v2d->maxzoom = 1.0f;
-				
-				/* tot rect has strictly regulated placement, and must only occur in +/- quadrant */
-				v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
-				v2d->keeptot = V2D_KEEPTOT_STRICT;
-				tot_changed = 1;
-				
-				/* scroller settings are currently not set here... that is left for regions... */
-			}
-			break;
-				
-			/* 'stack view' - practically the same as list/channel view, except is located in the pos y half instead. 
-			 *  zoom, aspect ratio, and alignment restrictions are set here */
-			case V2D_COMMONVIEW_STACK:
-			{
-				/* zoom + aspect ratio are locked */
-				v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
-				v2d->minzoom = v2d->maxzoom = 1.0f;
-				
-				/* tot rect has strictly regulated placement, and must only occur in +/+ quadrant */
-				v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
-				v2d->keeptot = V2D_KEEPTOT_STRICT;
-				tot_changed = 1;
-				
-				/* scroller settings are currently not set here... that is left for regions... */
-			}
-			break;
+			/* tot rect has strictly regulated placement, and must only occur in +/- quadrant */
+			v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
+			v2d->keeptot = V2D_KEEPTOT_STRICT;
+			tot_changed = do_init;
+			
+			/* scroller settings are currently not set here... that is left for regions... */
+		}
+		break;
+			
+		/* 'stack view' - practically the same as list/channel view, except is located in the pos y half instead. 
+		 *  zoom, aspect ratio, and alignment restrictions are set here */
+		case V2D_COMMONVIEW_STACK:
+		{
+			/* zoom + aspect ratio are locked */
+			v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
+			v2d->minzoom = v2d->maxzoom = 1.0f;
+			
+			/* tot rect has strictly regulated placement, and must only occur in +/+ quadrant */
+			v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
+			v2d->keeptot = V2D_KEEPTOT_STRICT;
+			tot_changed = do_init;
+			
+			/* scroller settings are currently not set here... that is left for regions... */
+		}
+		break;
+			
+		/* 'header' regions - zoom, aspect ratio, alignment, and panning restrictions are set here */
+		case V2D_COMMONVIEW_HEADER:
+		{
+			/* zoom + aspect ratio are locked */
+			v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
+			v2d->minzoom = v2d->maxzoom = 1.0f;
+			
+			if (do_init) {
+				v2d->tot.xmin = 0.0f;
+				v2d->tot.xmax = winx;
+				v2d->tot.ymin = 0.0f;
+				v2d->tot.ymax = winy;
+				v2d->cur = v2d->tot;
 				
-			/* 'header' regions - zoom, aspect ratio, alignment, and panning restrictions are set here */
-			case V2D_COMMONVIEW_HEADER:
-			{
-				/* zoom + aspect ratio are locked */
-				v2d->keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
-				v2d->minzoom = v2d->maxzoom = 1.0f;
 				v2d->min[0] = v2d->max[0] = (float)(winx - 1);
 				v2d->min[1] = v2d->max[1] = (float)(winy - 1);
-				
-				/* tot rect has strictly regulated placement, and must only occur in +/+ quadrant */
-				v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
-				v2d->keeptot = V2D_KEEPTOT_STRICT;
-				tot_changed = 1;
-				
-				/* panning in y-axis is prohibited */
-				v2d->keepofs = V2D_LOCKOFS_Y;
-				
-				/* absolutely no scrollers allowed */
-				v2d->scroll = 0;
-				
 			}
-			break;
+			/* tot rect has strictly regulated placement, and must only occur in +/+ quadrant */
+			v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_NEG_Y);
+			v2d->keeptot = V2D_KEEPTOT_STRICT;
+			tot_changed = do_init;
+			
+			/* panning in y-axis is prohibited */
+			v2d->keepofs = V2D_LOCKOFS_Y;
+			
+			/* absolutely no scrollers allowed */
+			v2d->scroll = 0;
+			
+		}
+		break;
+		
+		/* panels view, with horizontal/vertical align */
+		case V2D_COMMONVIEW_PANELS_UI:
+		{
 			
-			/* panels view, with horizontal/vertical align */
-			case V2D_COMMONVIEW_PANELS_UI:
-			{
+			/* for now, aspect ratio should be maintained, and zoom is clamped within sane default limits */
+			v2d->keepzoom = (V2D_KEEPASPECT | V2D_LIMITZOOM | V2D_KEEPZOOM);
+			v2d->minzoom = 0.5f;
+			v2d->maxzoom = 2.0f;
+			
+			v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
+			v2d->keeptot = V2D_KEEPTOT_BOUNDS;
+			
+			/* note, scroll is being flipped in ED_region_panels() drawing */
+			v2d->scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
+			v2d->scroll |= V2D_SCROLL_VERTICAL_HIDE;
+
+			if (do_init) {
 				float panelzoom = (style) ? style->panelzoom : 1.0f;
+				float scrolw = v2d->scroll & V2D_SCROLL_RIGHT ? V2D_SCROLL_WIDTH : 0.0f;
 				
-				/* for now, aspect ratio should be maintained, and zoom is clamped within sane default limits */
-				v2d->keepzoom = (V2D_KEEPASPECT | V2D_LIMITZOOM | V2D_KEEPZOOM);
-				v2d->minzoom = 0.5f;
-				v2d->maxzoom = 2.0f;
-				//tot_changed = 1;
-				
-				v2d->align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
-				v2d->keeptot = V2D_KEEPTOT_BOUNDS;
-				
-				v2d->scroll |= (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM);
-				v2d->scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
-				v2d->scroll &= ~V2D_SCROLL_VERTICAL_HIDE;
-
 				v2d->tot.xmin = 0.0f;
-				v2d->tot.xmax = winx;
+				v2d->tot.xmax = winx - scrolw;
 				
 				v2d->tot.ymax = 0.0f;
 				v2d->tot.ymin = -winy;
 				
 				v2d->cur.xmin = 0.0f;
-				/* bad workaround for keeping zoom level with scrollers */
-				v2d->cur.xmax = (winx - V2D_SCROLL_WIDTH) * panelzoom;
+				v2d->cur.xmax = (winx) * panelzoom - scrolw;
 				
 				v2d->cur.ymax = 0.0f;
 				v2d->cur.ymin = (-winy) * panelzoom;
 			}
-			break;
-				
-			/* other view types are completely defined using their own settings already */
-			default:
-				/* we don't do anything here, as settings should be fine, but just make sure that rect */
-				break;
 		}
+		break;
+			
+		/* other view types are completely defined using their own settings already */
+		default:
+			/* we don't do anything here, as settings should be fine, but just make sure that rect */
+			break;
 	}
 	
+	/* set initialized flag so that View2D doesn't get reinitialised next time again */
+	v2d->flag |= V2D_IS_INITIALISED;
+
 	/* store view size */
 	v2d->winx = winx;
 	v2d->winy = winy;
 	
-	/* set masks */
-	view2d_masks(v2d);
+	/* set masks (always do), but leave scroller scheck to totrect_set */
+	view2d_masks(v2d, 0);
 	
 	/* set 'tot' rect before setting cur? */
-	if (tot_changed) 
-		UI_view2d_totRect_set_resize(v2d, winx, winy, !init);
+	/* XXX confusing stuff here still - I made this function not check scroller hide - that happens in totrect_set */
+	if (tot_changed)
+		UI_view2d_totRect_set_resize(v2d, winx, winy, !do_init);
 	else
-		UI_view2d_curRect_validate_resize(v2d, !init);
+		ui_view2d_curRect_validate_resize(v2d, !do_init, 0);
+	
 }
 
 /* Ensure View2D rects remain in a viable configuration 
  *	- cur is not allowed to be: larger than max, smaller than min, or outside of tot
  */
 // XXX pre2.5 -> this used to be called  test_view2d()
-void UI_view2d_curRect_validate_resize(View2D *v2d, int resize)
+static void ui_view2d_curRect_validate_resize(View2D *v2d, int resize, int mask_scrollers)
 {
 	float totwidth, totheight, curwidth, curheight, width, height;
 	float winx, winy;
@@ -715,12 +733,12 @@ void UI_view2d_curRect_validate_resize(View2D *v2d, int resize)
 	}
 	
 	/* set masks */
-	view2d_masks(v2d);
+	view2d_masks(v2d, mask_scrollers);
 }
 
 void UI_view2d_curRect_validate(View2D *v2d)
 {
-	UI_view2d_curRect_validate_resize(v2d, 0);
+	ui_view2d_curRect_validate_resize(v2d, 0, 1);
 }
 
 /* ------------------ */
@@ -844,7 +862,7 @@ void UI_view2d_curRect_reset(View2D *v2d)
 /* Change the size of the maximum viewable area (i.e. 'tot' rect) */
 void UI_view2d_totRect_set_resize(View2D *v2d, int width, int height, int resize)
 {
-	int scroll = view2d_scroll_mapped(v2d->scroll);
+//	int scroll = view2d_scroll_mapped(v2d->scroll);
 	
 	/* don't do anything if either value is 0 */
 	width = abs(width);
@@ -853,10 +871,10 @@ void UI_view2d_totRect_set_resize(View2D *v2d, int width, int height, int resize
 	/* hrumf! */
 	/* XXX: there are work arounds for this in the panel and file browse code. */
 	/* round to int, because this is called with width + V2D_SCROLL_WIDTH */
-	if (scroll & V2D_SCROLL_HORIZONTAL) 
-		width -= (int)V2D_SCROLL_WIDTH;
-	if (scroll & V2D_SCROLL_VERTICAL) 
-		height -= (int)V2D_SCROLL_HEIGHT;
+//	if (scroll & V2D_SCROLL_HORIZONTAL)
+//		width -= (int)V2D_SCROLL_WIDTH;
+//	if (scroll & V2D_SCROLL_VERTICAL)
+//		height -= (int)V2D_SCROLL_HEIGHT;
 	
 	if (ELEM(0, width, height)) {
 		if (G.debug & G_DEBUG)
@@ -903,12 +921,21 @@ void UI_view2d_totRect_set_resize(View2D *v2d, int width, int height, int resize
 	}
 	
 	/* make sure that 'cur' rect is in a valid state as a result of these changes */
-	UI_view2d_curRect_validate_resize(v2d, resize);
+	ui_view2d_curRect_validate_resize(v2d, resize, 1);
+	
 }
 
 void UI_view2d_totRect_set(View2D *v2d, int width, int height)
 {
+	int scroll = view2d_scroll_mapped(v2d->scroll);
+
 	UI_view2d_totRect_set_resize(v2d, width, height, 0);
+	
+	/* solve bad recursion... if scroller state changed, mask is different, so you get different rects */
+	if (scroll != view2d_scroll_mapped(v2d->scroll)) {
+		UI_view2d_totRect_set_resize(v2d, width, height, 0);
+	}
+	
 }
 
 int UI_view2d_tab_set(View2D *v2d, int tab)
@@ -1494,15 +1521,6 @@ View2DScrollers *UI_view2d_scrollers_calc(const bContext *C, View2D *v2d,
 			CLAMP(scrollers->hor_min, hor.xmin, hor.xmax - V2D_SCROLLER_HANDLE_SIZE);
 		}
 		
-		/* check whether sliders can disappear due to the full-range being used */
-		if (v2d->keeptot) {
-			if ((fac1 <= 0.0f) && (fac2 >= 1.0f)) {
-				v2d->scroll |= V2D_SCROLL_HORIZONTAL_FULLR;
-				scrollers->horfull = 1;
-			}
-			else
-				v2d->scroll &= ~V2D_SCROLL_HORIZONTAL_FULLR;
-		}
 	}
 	
 	/* vertical scrollers */
@@ -1536,15 +1554,6 @@ View2DScrollers *UI_view2d_scrollers_calc(const bContext *C, View2D *v2d,
 			CLAMP(scrollers->vert_min, vert.ymin, vert.ymax - V2D_SCROLLER_HANDLE_SIZE);
 		}
 
-		/* check whether sliders can disappear due to the full-range being used */
-		if (v2d->keeptot) {
-			if ((fac1 <= 0.0f) && (fac2 >= 1.0f)) {
-				v2d->scroll |= V2D_SCROLL_VERTICAL_FULLR;
-				scrollers->vertfull = 1;
-			}
-			else
-				v2d->scroll &= ~V2D_SCROLL_VERTICAL_FULLR;
-		}
 	}
 	
 	/* grid markings on scrollbars */
@@ -1618,45 +1627,42 @@ void UI_view2d_scrollers_draw(const bContext *C, View2D *v2d, View2DScrollers *v
 	
 	/* horizontal scrollbar */
 	if (scroll & V2D_SCROLL_HORIZONTAL) {
-		/* only draw scrollbar when it doesn't fill the entire space */
-		if (vs->horfull == 0) {
-			bTheme *btheme = UI_GetTheme();
-			uiWidgetColors wcol = btheme->tui.wcol_scroll;
-			rcti slider;
-			int state;
-			unsigned char col[4];
-			
-			slider.xmin = vs->hor_min;
-			slider.xmax = vs->hor_max;
-			slider.ymin = hor.ymin;
-			slider.ymax = hor.ymax;
-			
-			state = (v2d->scroll_ui & V2D_SCROLL_H_ACTIVE) ? UI_SCROLL_PRESSED : 0;
-			
-			/* show zoom handles if:
-			 *	- zooming on x-axis is allowed (no scroll otherwise)
-			 *	- slider bubble is large enough (no overdraw confusion)
-			 *	- scale is shown on the scroller 
-			 *	  (workaround to make sure that button windows don't show these, 
-			 *		and only the time-grids with their zoomability can do so)
-			 */
-			if ((v2d->keepzoom & V2D_LOCKZOOM_X) == 0 &&
-			    (v2d->scroll & V2D_SCROLL_SCALE_HORIZONTAL) &&
-			    (BLI_rcti_size_x(&slider) > V2D_SCROLLER_HANDLE_SIZE))
-			{
-				state |= UI_SCROLL_ARROWS;
-			}
-			
-			/* clean rect behind slider, but not with transparent background */
-			UI_GetThemeColor4ubv(TH_BACK, col);
-			if (col[3] == 255) {
-				glColor3ub(col[0], col[1], col[2]);
-				glRecti(v2d->hor.xmin, v2d->hor.ymin, v2d->hor.xmax, v2d->hor.ymax);
-			}
-			
-			uiWidgetScrollDraw(&wcol, &hor, &slider, state);
+		bTheme *btheme = UI_GetTheme();
+		uiWidgetColors wcol = btheme->tui.wcol_scroll;
+		rcti slider;
+		int state;
+		unsigned char col[4];
+		
+		slider.xmin = vs->hor_min;
+		slider.xmax = vs->hor_max;
+		slider.ymin = hor.ymin;
+		slider.ymax = hor.ymax;
+		
+		state = (v2d->scroll_ui & V2D_SCROLL_H_ACTIVE) ? UI_SCROLL_PRESSED : 0;
+		
+		/* show zoom handles if:
+		 *	- zooming on x-axis is allowed (no scroll otherwise)
+		 *	- slider bubble is large enough (no overdraw confusion)
+		 *	- scale is shown on the scroller 
+		 *	  (workaround to make sure that button windows don't show these, 
+		 *		and only the time-grids with their zoomability can do so)
+		 */
+		if ((v2d->keepzoom & V2D_LOCKZOOM_X) == 0 &&
+			(v2d->scroll & V2D_SCROLL_SCALE_HORIZONTAL) &&
+			(BLI_rcti_size_x(&slider) > V2D_SCROLLER_HANDLE_SIZE))
+		{
+			state |= UI_SCROLL_ARROWS;
 		}
 		
+		/* clean rect behind slider, but not with transparent background */
+		UI_GetThemeColor4ubv(TH_BACK, col);
+		if (col[3] == 255) {
+			glColor3ub(col[0], col[1], col[2]);
+			glRecti(v2d->hor.xmin, v2d->hor.ymin, v2d->hor.xmax, v2d->hor.ymax);
+		}
+		
+		uiWidgetScrollDraw(&wcol, &hor, &slider, state);
+		
 		/* scale indicators */
 		if ((scroll & V2D_SCROLL_SCALE_HORIZONTAL) && (vs->grid)) {
 			View2DGrid *grid = vs->grid;
@@ -1734,45 +1740,42 @@ void UI_view2d_scrollers_draw(const bContext *C, View2D *v2d, View2DScrollers *v
 	
 	/* vertical scrollbar */
 	if (scroll & V2D_SCROLL_VERTICAL) {
-		/* only draw scrollbar when it doesn't fill the entire space */
-		if (vs->vertfull == 0) {
-			bTheme *btheme = UI_GetTheme();
-			uiWidgetColors wcol = btheme->tui.wcol_scroll;
-			rcti slider;
-			int state;
-			unsigned char col[4];
-			
-			slider.xmin = vert.xmin;
-			slider.xmax = vert.xmax;
-			slider.ymin = vs->vert_min;
-			slider.ymax = vs->vert_max;
-			
-			state = (v2d->scroll_ui & V2D_SCROLL_V_ACTIVE) ? UI_SCROLL_PRESSED : 0;
-			
-			/* show zoom handles if:
-			 *	- zooming on y-axis is allowed (no scroll otherwise)
-			 *	- slider bubble is large enough (no overdraw confusion)
-			 *	- scale is shown on the scroller 
-			 *	  (workaround to make sure that button windows don't show these, 
-			 *		and only the time-grids with their zoomability can do so)
-			 */
-			if ((v2d->keepzoom & V2D_LOCKZOOM_Y) == 0 &&
-			    (v2d->scroll & V2D_SCROLL_SCALE_VERTICAL) &&
-			    (BLI_rcti_size_y(&slider) > V2D_SCROLLER_HANDLE_SIZE))
-			{
-				state |= UI_SCROLL_ARROWS;
-			}
-			
-			/* clean rect behind slider, but not with transparent background */
-			UI_GetThemeColor4ubv(TH_BACK, col);
-			if (col[3] == 255) {
-				glColor3ub(col[0], col[1], col[2]);
-				glRecti(v2d->vert.xmin, v2d->vert.ymin, v2d->vert.xmax, v2d->vert.ymax);
-			}
-			
-			uiWidgetScrollDraw(&wcol, &vert, &slider, state);
+		bTheme *btheme = UI_GetTheme();
+		uiWidgetColors wcol = btheme->tui.wcol_scroll;
+		rcti slider;
+		int state;
+		unsigned char col[4];
+		
+		slider.xmin = vert.xmin;
+		slider.xmax = vert.xmax;
+		slider.ymin = vs->vert_min;
+		slider.ymax = vs->vert_max;
+		
+		state = (v2d->scroll_ui & V2D_SCROLL_V_ACTIVE) ? UI_SCROLL_PRESSED : 0;
+		
+		/* show zoom handles if:
+		 *	- zooming on y-axis is allowed (no scroll otherwise)
+		 *	- slider bubble is large enough (no overdraw confusion)
+		 *	- scale is shown on the scroller 
+		 *	  (workaround to make sure that button windows don't show these, 
+		 *		and only the time-grids with their zoomability can do so)
+		 */
+		if ((v2d->keepzoom & V2D_LOCKZOOM_Y) == 0 &&
+			(v2d->scroll & V2D_SCROLL_SCALE_VERTICAL) &&
+			(BLI_rcti_size_y(&slider) > V2D_SCROLLER_HANDLE_SIZE))
+		{
+			state |= UI_SCROLL_ARROWS;
 		}
 		
+		/* clean rect behind slider, but not with transparent background */
+		UI_GetThemeColor4ubv(TH_BACK, col);
+		if (col[3] == 255) {
+			glColor3ub(col[0], col[1], col[2]);
+			glRecti(v2d->vert.xmin, v2d->vert.ymin, v2d->vert.xmax, v2d->vert.ymax);
+		}
+		
+		uiWidgetScrollDraw(&wcol, &vert, &slider, state);
+		
 		
 		/* scale indiators */
 		if ((scroll & V2D_SCROLL_SCALE_VERTICAL) && (vs->grid)) {
diff --git a/source/blender/editors/interface/view2d_ops.c b/source/blender/editors/interface/view2d_ops.c
index 006644bf366..8bea308e90a 100644
--- a/source/blender/editors/interface/view2d_ops.c
+++ b/source/blender/editors/interface/view2d_ops.c
@@ -1744,8 +1744,8 @@ static int scroller_activate_invoke(bContext *C, wmOperator *op, wmEvent *event)
 		}
 		
 		/* zone is also inappropriate if scroller is not visible... */
-		if (((vsm->scroller == 'h') && (v2d->scroll & (V2D_SCROLL_HORIZONTAL_HIDE | V2D_SCROLL_HORIZONTAL_FULLR))) ||
-		    ((vsm->scroller == 'v') && (v2d->scroll & (V2D_SCROLL_VERTICAL_HIDE | V2D_SCROLL_VERTICAL_FULLR))) )
+		if (((vsm->scroller == 'h') && (v2d->scroll & (V2D_SCROLL_HORIZONTAL_FULLR))) ||
+		    ((vsm->scroller == 'v') && (v2d->scroll & (V2D_SCROLL_VERTICAL_FULLR))) )
 		{
 			/* free customdata initialized */
 			scroller_activate_exit(C, op);
diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index fbdec3dd8ad..5d37765cd58 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -574,8 +574,8 @@ static void area_azone_initialize(bScreen *screen, ScrArea *sa)
 	az = (AZone *)MEM_callocN(sizeof(AZone), "actionzone");
 	BLI_addtail(&(sa->actionzones), az);
 	az->type = AZONE_AREA;
-	az->x1 = sa->totrct.xmin - 1;
-	az->y1 = sa->totrct.ymin - 1;
+	az->x1 = sa->totrct.xmin;
+	az->y1 = sa->totrct.ymin;
 	az->x2 = sa->totrct.xmin + (AZONESPOT - 1);
 	az->y2 = sa->totrct.ymin + (AZONESPOT - 1);
 	BLI_rcti_init(&az->rect, az->x1, az->x2, az->y1, az->y2);
@@ -1300,6 +1300,9 @@ void ED_region_init(bContext *C, ARegion *ar)
 	ar->winx = BLI_rcti_size_x(&ar->winrct) + 1;
 	ar->winy = BLI_rcti_size_y(&ar->winrct) + 1;
 	
+	/* v2d mask is used to subtract scrollbars from a 2d view. Needs initialize here. */
+	BLI_rcti_init(&ar->v2d.mask, 0, ar->winx - 1, 0, ar->winy -1);
+
 	/* UI convention */
 	wmOrtho2(-0.01f, ar->winx - 0.01f, -0.01f, ar->winy - 0.01f);
 	glLoadIdentity();
@@ -1612,86 +1615,141 @@ void ED_region_panels(const bContext *C, ARegion *ar, int vertical, const char *
 	View2D *v2d = &ar->v2d;
 	View2DScrollers *scrollers;
 	int x, y, xco, yco, w, em, triangle, open, newcontext = 0;
-	
+	int redo;
+	int scroll;
+
 	if (contextnr >= 0)
 		newcontext = UI_view2d_tab_set(v2d, contextnr);
-
+	
+	/* before setting the view */
 	if (vertical) {
-		w = BLI_rctf_size_x(&v2d->cur);
-		em = (ar->type->prefsizex) ? UI_UNIT_Y / 2 : UI_UNIT_Y;
+		/* only allow scrolling in vertical direction */
+		v2d->keepofs |= V2D_LOCKOFS_X | V2D_KEEPOFS_Y;
+		v2d->keepofs &= ~(V2D_LOCKOFS_Y | V2D_KEEPOFS_X);
+		v2d->scroll &= ~(V2D_SCROLL_BOTTOM);
+		v2d->scroll |= (V2D_SCROLL_RIGHT);
 	}
 	else {
-		w = UI_PANEL_WIDTH;
-		em = (ar->type->prefsizex) ? UI_UNIT_Y / 2 : UI_UNIT_Y;
+		/* for now, allow scrolling in both directions (since layouts are optimized for vertical,
+		 * they often don't fit in horizontal layout)
+		 */
+		v2d->keepofs &= ~(V2D_LOCKOFS_X | V2D_LOCKOFS_Y | V2D_KEEPOFS_X | V2D_KEEPOFS_Y);
+		v2d->scroll |= (V2D_SCROLL_BOTTOM);
+		v2d->scroll &= ~(V2D_SCROLL_RIGHT);
 	}
 
-	/* create panels */
-	uiBeginPanels(C, ar);
+	scroll = v2d->scroll;
+	
+	/* sortof hack - but we cannot predict the height of panels, until it's being generated */
+	/* the layout engine works with fixed width (from v2d->cur), which is being set at end of the loop */
+	/* in case scroller settings (hide flags) differ from previous, the whole loop gets done again */
+	for (redo = 2; redo > 0; redo--) {
+		
+		if (vertical) {
+			w = BLI_rctf_size_x(&v2d->cur);
+			em = (ar->type->prefsizex) ? UI_UNIT_Y / 2 : UI_UNIT_Y;
+		}
+		else {
+			w = UI_PANEL_WIDTH;
+			em = (ar->type->prefsizex) ? UI_UNIT_Y / 2 : UI_UNIT_Y;
+		}
+		
+		/* create panels */
+		uiBeginPanels(C, ar);
 
-	/* set view2d view matrix for scrolling (without scrollers) */
-	UI_view2d_view_ortho(v2d);
+		/* set view2d view matrix  - uiBeginBlock() stores it */
+		UI_view2d_view_ortho(v2d);
 
-	for (pt = ar->type->paneltypes.first; pt; pt = pt->next) {
-		/* verify context */
-		if (context)
-			if (pt->context[0] && strcmp(context, pt->context) != 0)
-				continue;
+		for (pt = ar->type->paneltypes.first; pt; pt = pt->next) {
+			/* verify context */
+			if (context)
+				if (pt->context[0] && strcmp(context, pt->context) != 0)
+					continue;
 
-		/* draw panel */
-		if (pt->draw && (!pt->poll || pt->poll(C, pt))) {
-			block = uiBeginBlock(C, ar, pt->idname, UI_EMBOSS);
-			panel = uiBeginPanel(sa, ar, block, pt, &open);
+			/* draw panel */
+			if (pt->draw && (!pt->poll || pt->poll(C, pt))) {
+				block = uiBeginBlock(C, ar, pt->idname, UI_EMBOSS);
+				panel = uiBeginPanel(sa, ar, block, pt, &open);
 
-			/* bad fixed values */
-			triangle = (int)(UI_UNIT_Y * 1.1f);
+				/* bad fixed values */
+				triangle = (int)(UI_UNIT_Y * 1.1f);
 
-			if (pt->draw_header && !(pt->flag & PNL_NO_HEADER) && (open || vertical)) {
-				/* for enabled buttons */
-				panel->layout = uiBlockLayout(block, UI_LAYOUT_HORIZONTAL, UI_LAYOUT_HEADER,
-				                              triangle, (UI_UNIT_Y * 1.1f) + style->panelspace, UI_UNIT_Y, 1, style);
+				if (pt->draw_header && !(pt->flag & PNL_NO_HEADER) && (open || vertical)) {
+					/* for enabled buttons */
+					panel->layout = uiBlockLayout(block, UI_LAYOUT_HORIZONTAL, UI_LAYOUT_HEADER,
+												  triangle, (UI_UNIT_Y * 1.1f) + style->panelspace, UI_UNIT_Y, 1, style);
 
-				pt->draw_header(C, panel);
+					pt->draw_header(C, panel);
 
-				uiBlockLayoutResolve(block, &xco, &yco);
-				panel->labelofs = xco - triangle;
-				panel->layout = NULL;
-			}
-			else {
-				panel->labelofs = 0;
-			}
+					uiBlockLayoutResolve(block, &xco, &yco);
+					panel->labelofs = xco - triangle;
+					panel->layout = NULL;
+				}
+				else {
+					panel->labelofs = 0;
+				}
 
-			if (open) {
-				short panelContext;
-				
-				/* panel context can either be toolbar region or normal panels region */
-				if (ar->regiontype == RGN_TYPE_TOOLS)
-					panelContext = UI_LAYOUT_TOOLBAR;
-				else
-					panelContext = UI_LAYOUT_PANEL;
-				
-				panel->layout = uiBlockLayout(block, UI_LAYOUT_VERTICAL, panelContext,
-				                              style->panelspace, 0, w - 2 * style->panelspace, em, style);
+				if (open) {
+					short panelContext;
+					
+					/* panel context can either be toolbar region or normal panels region */
+					if (ar->regiontype == RGN_TYPE_TOOLS)
+						panelContext = UI_LAYOUT_TOOLBAR;
+					else
+						panelContext = UI_LAYOUT_PANEL;
+					
+					panel->layout = uiBlockLayout(block, UI_LAYOUT_VERTICAL, panelContext,
+												  style->panelspace, 0, w - 2 * style->panelspace, em, style);
 
-				pt->draw(C, panel);
+					pt->draw(C, panel);
 
-				uiBlockLayoutResolve(block, &xco, &yco);
-				panel->layout = NULL;
+					uiBlockLayoutResolve(block, &xco, &yco);
+					panel->layout = NULL;
 
-				yco -= 2 * style->panelspace;
-				uiEndPanel(block, w, -yco);
-			}
-			else {
-				yco = 0;
-				uiEndPanel(block, w, 0);
+					yco -= 2 * style->panelspace;
+					uiEndPanel(block, w, -yco);
+				}
+				else {
+					yco = 0;
+					uiEndPanel(block, w, 0);
+				}
+
+				uiEndBlock(C, block);
 			}
+		}
 
-			uiEndBlock(C, block);
+		/* align panels and return size */
+		uiEndPanels(C, ar, &x, &y);
+		
+		/* before setting the view */
+		if (vertical) {
+			/* we always keep the scroll offset - so the total view gets increased with the scrolled away part */
+			if (v2d->cur.ymax < - 0.001f)
+				y = min_ii(y, v2d->cur.ymin);
+			
+			y = -y;
+		}
+		else {
+			/* don't jump back when panels close or hide */
+			if (!newcontext)
+				x = max_ii(x, v2d->cur.xmax);
+			y = -y;
+		}
+		
+		/* this also changes the 'cur' */
+		UI_view2d_totRect_set(v2d, x, y);
+		
+		if (scroll != v2d->scroll) {
+			/* Note: this code scales fine, but because of rounding differences, positions of elements
+			 * flip +1 or -1 pixel compared to redoing the entire layout again.
+			 * Leaving in commented code for future tests */
+			/* uiScalePanels(ar, BLI_rctf_size_x(&v2d->cur));
+			   break; */
 		}
+		else break;
 	}
-
-	/* align panels and return size */
-	uiEndPanels(C, ar, &x, &y);
-
+	
+	
 	/* clear */
 	if (ar->overlap) {
 		/* view should be in pixelspace */
@@ -1706,36 +1764,6 @@ void ED_region_panels(const bContext *C, ARegion *ar, int vertical, const char *
 		glClear(GL_COLOR_BUFFER_BIT);
 	}
 	
-	/* before setting the view */
-	if (vertical) {
-		/* only allow scrolling in vertical direction */
-		v2d->keepofs |= V2D_LOCKOFS_X | V2D_KEEPOFS_Y;
-		v2d->keepofs &= ~(V2D_LOCKOFS_Y | V2D_KEEPOFS_X);
-		v2d->scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
-		v2d->scroll &= ~V2D_SCROLL_VERTICAL_HIDE;
-
-		/* ensure tot is set correctly, to keep views on bottons, with sliders */
-		y = min_ii(y, v2d->cur.ymin);
-		y = -y;
-	}
-	else {
-		/* for now, allow scrolling in both directions (since layouts are optimized for vertical,
-		 * they often don't fit in horizontal layout)
-		 */
-		v2d->keepofs &= ~(V2D_LOCKOFS_X | V2D_LOCKOFS_Y | V2D_KEEPOFS_X | V2D_KEEPOFS_Y);
-		//v2d->keepofs |= V2D_LOCKOFS_Y|V2D_KEEPOFS_X;
-		//v2d->keepofs &= ~(V2D_LOCKOFS_X|V2D_KEEPOFS_Y);
-		v2d->scroll |= V2D_SCROLL_VERTICAL_HIDE;
-		v2d->scroll &= ~V2D_SCROLL_HORIZONTAL_HIDE;
-
-		/* don't jump back when panels close or hide */
-		if (!newcontext)
-			x = max_ii(x, v2d->cur.xmax);
-		y = -y;
-	}
-
-	/* +V2D_SCROLL_HEIGHT is workaround to set the actual height (needs to be int) */
-	UI_view2d_totRect_set(v2d, x + (int)V2D_SCROLL_WIDTH, y + (int)V2D_SCROLL_HEIGHT);
 
 	/* set the view */
 	UI_view2d_view_ortho(v2d);
@@ -1756,16 +1784,9 @@ void ED_region_panels_init(wmWindowManager *wm, ARegion *ar)
 {
 	wmKeyMap *keymap;
 	
-	/* XXX quick hacks for files saved with 2.5 already (i.e. the builtin defaults file)
-	 * scrollbars for button regions */
-	ar->v2d.scroll |= (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM);
-	ar->v2d.scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
-	ar->v2d.scroll &= ~V2D_SCROLL_VERTICAL_HIDE;
-	ar->v2d.keepzoom |= V2D_KEEPZOOM;
-
-	/* correctly initialized User-Prefs? */
-	if (!(ar->v2d.align & V2D_ALIGN_NO_POS_Y))
-		ar->v2d.flag &= ~V2D_IS_INITIALISED;
+	/* used for correctly initialized User-Prefs only?  */
+//	if (!(ar->v2d.align & V2D_ALIGN_NO_POS_Y))
+//		ar->v2d.flag &= ~V2D_IS_INITIALISED;
 
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_PANELS_UI, ar->winx, ar->winy);
 
@@ -1828,6 +1849,7 @@ void ED_region_header(const bContext *C, ARegion *ar)
 
 void ED_region_header_init(ARegion *ar)
 {
+	ar->v2d.flag &= ~V2D_IS_INITIALISED;
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_HEADER, ar->winx, ar->winy);
 }
 
diff --git a/source/blender/editors/space_action/action_draw.c b/source/blender/editors/space_action/action_draw.c
index 9bd7d2a44ca..4b1954c8889 100644
--- a/source/blender/editors/space_action/action_draw.c
+++ b/source/blender/editors/space_action/action_draw.c
@@ -82,13 +82,7 @@ void draw_channel_names(bContext *C, bAnimContext *ac, ARegion *ar)
 	filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
 	items = ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 	
-	/* Update max-extent of channels here (taking into account scrollers):
-	 *  - this is done to allow the channel list to be scrollable, but must be done here
-	 *    to avoid regenerating the list again and/or also because channels list is drawn first
-	 *	- offset of ACHANNEL_HEIGHT*2 is added to the height of the channels, as first is for 
-	 *	  start of list offset, and the second is as a correction for the scrollers.
-	 */
-	height = ((items * ACHANNEL_STEP) + (ACHANNEL_HEIGHT * 2));
+	height = ((items * ACHANNEL_STEP) + (ACHANNEL_HEIGHT));
 	if (height > BLI_rcti_size_y(&v2d->mask)) {
 		/* don't use totrect set, as the width stays the same 
 		 * (NOTE: this is ok here, the configuration is pretty straightforward) 
@@ -199,13 +193,7 @@ void draw_channel_strips(bAnimContext *ac, SpaceAction *saction, ARegion *ar)
 	filter = (ANIMFILTER_DATA_VISIBLE | ANIMFILTER_LIST_VISIBLE | ANIMFILTER_LIST_CHANNELS);
 	items = ANIM_animdata_filter(ac, &anim_data, filter, ac->data, ac->datatype);
 	
-	/* Update max-extent of channels here (taking into account scrollers):
-	 *  - this is done to allow the channel list to be scrollable, but must be done here
-	 *    to avoid regenerating the list again and/or also because channels list is drawn first
-	 *	- offset of ACHANNEL_HEIGHT*2 is added to the height of the channels, as first is for 
-	 *	  start of list offset, and the second is as a correction for the scrollers.
-	 */
-	height = ((items * ACHANNEL_STEP) + (ACHANNEL_HEIGHT * 2));
+	height = ((items * ACHANNEL_STEP) + (ACHANNEL_HEIGHT));
 	/* don't use totrect set, as the width stays the same 
 	 * (NOTE: this is ok here, the configuration is pretty straightforward) 
 	 */
diff --git a/source/blender/editors/space_action/space_action.c b/source/blender/editors/space_action/space_action.c
index c5f3ccee101..e0ca589c1fb 100644
--- a/source/blender/editors/space_action/space_action.c
+++ b/source/blender/editors/space_action/space_action.c
@@ -219,6 +219,9 @@ static void action_channel_area_init(wmWindowManager *wm, ARegion *ar)
 {
 	wmKeyMap *keymap;
 	
+	/* ensure the 2d view sync works - main region has bottom scroller */
+	ar->v2d.scroll = V2D_SCROLL_BOTTOM;
+	
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
 	
 	/* own keymap */
@@ -231,7 +234,6 @@ static void action_channel_area_draw(const bContext *C, ARegion *ar)
 	/* draw entirely, view changes should be handled here */
 	bAnimContext ac;
 	View2D *v2d = &ar->v2d;
-	View2DScrollers *scrollers;
 	
 	/* clear and setup matrix */
 	UI_ThemeClearColor(TH_BACK);
@@ -247,10 +249,7 @@ static void action_channel_area_draw(const bContext *C, ARegion *ar)
 	/* reset view matrix */
 	UI_view2d_view_restore(C);
 	
-	/* scrollers */
-	scrollers = UI_view2d_scrollers_calc(C, v2d, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY, V2D_ARG_DUMMY);
-	UI_view2d_scrollers_draw(C, v2d, scrollers);
-	UI_view2d_scrollers_free(scrollers);
+	/* no scrollers here */
 }
 
 
diff --git a/source/blender/editors/space_file/file_draw.c b/source/blender/editors/space_file/file_draw.c
index fb438ae45fb..08f01b47b52 100644
--- a/source/blender/editors/space_file/file_draw.c
+++ b/source/blender/editors/space_file/file_draw.c
@@ -321,8 +321,7 @@ void file_calc_previews(const bContext *C, ARegion *ar)
 	View2D *v2d = &ar->v2d;
 	
 	ED_fileselect_init_layout(sfile, ar);
-	/* +SCROLL_HEIGHT is bad hack to work around issue in UI_view2d_totRect_set */
-	UI_view2d_totRect_set(v2d, sfile->layout->width, sfile->layout->height + V2D_SCROLL_HEIGHT);
+	UI_view2d_totRect_set(v2d, sfile->layout->width, sfile->layout->height);
 }
 
 static void file_draw_preview(uiBlock *block, struct direntry *file, int sx, int sy, ImBuf *imb, FileLayout *layout, short dropshadow)
diff --git a/source/blender/editors/space_graph/space_graph.c b/source/blender/editors/space_graph/space_graph.c
index fa7c6bd472a..734c0e6c479 100644
--- a/source/blender/editors/space_graph/space_graph.c
+++ b/source/blender/editors/space_graph/space_graph.c
@@ -309,6 +309,12 @@ static void graph_channel_area_init(wmWindowManager *wm, ARegion *ar)
 {
 	wmKeyMap *keymap;
 	
+	/* make sure we keep the hide flags */
+	ar->v2d.scroll |= (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM);
+	ar->v2d.scroll &= ~(V2D_SCROLL_LEFT | V2D_SCROLL_TOP);	/* prevent any noise of past */
+	ar->v2d.scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
+	ar->v2d.scroll |= V2D_SCROLL_VERTICAL_HIDE;
+	
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
 	
 	/* own keymap */
diff --git a/source/blender/editors/space_outliner/outliner_draw.c b/source/blender/editors/space_outliner/outliner_draw.c
index 222dcac454f..1a058104c78 100644
--- a/source/blender/editors/space_outliner/outliner_draw.c
+++ b/source/blender/editors/space_outliner/outliner_draw.c
@@ -421,17 +421,17 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				
 				uiBlockSetEmboss(block, UI_EMBOSSN);
 				bt = uiDefIconButR(block, ICONTOG, 0, ICON_RESTRICT_VIEW_OFF,
-				                   (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                   (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                   &ptr, "hide", -1, 0, 0, -1, -1, NULL);
 				uiButSetFunc(bt, restrictbutton_view_cb, scene, ob);
 				
 				bt = uiDefIconButR(block, ICONTOG, 0, ICON_RESTRICT_SELECT_OFF,
-				                   (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                   (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                   &ptr, "hide_select", -1, 0, 0, -1, -1, NULL);
 				uiButSetFunc(bt, restrictbutton_sel_cb, scene, ob);
 				
 				bt = uiDefIconButR(block, ICONTOG, 0, ICON_RESTRICT_RENDER_OFF,
-				                   (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                   (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                   &ptr, "hide_render", -1, 0, 0, -1, -1, NULL);
 				uiButSetFunc(bt, restrictbutton_rend_cb, scene, ob);
 				
@@ -446,19 +446,19 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 
 				restrict_bool = group_restrict_flag(gr, OB_RESTRICT_VIEW);
 				bt = uiDefIconBut(block, ICONTOG, 0, restrict_bool ? ICON_RESTRICT_VIEW_ON : ICON_RESTRICT_VIEW_OFF,
-				                  (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                  (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                  NULL, 0, 0, 0, 0, "Restrict/Allow visibility in the 3D View");
 				uiButSetFunc(bt, restrictbutton_gr_restrict_view, scene, gr);
 
 				restrict_bool = group_restrict_flag(gr, OB_RESTRICT_SELECT);
 				bt = uiDefIconBut(block, ICONTOG, 0, restrict_bool ? ICON_RESTRICT_SELECT_ON : ICON_RESTRICT_SELECT_OFF,
-				                  (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                  (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                  NULL, 0, 0, 0, 0, "Restrict/Allow selection in the 3D View");
 				uiButSetFunc(bt, restrictbutton_gr_restrict_select, scene, gr);
 
 				restrict_bool = group_restrict_flag(gr, OB_RESTRICT_RENDER);
 				bt = uiDefIconBut(block, ICONTOG, 0, restrict_bool ? ICON_RESTRICT_RENDER_ON : ICON_RESTRICT_RENDER_OFF,
-				                  (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                  (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                  NULL, 0, 0, 0, 0, "Restrict/Allow renderability");
 				uiButSetFunc(bt, restrictbutton_gr_restrict_render, scene, gr);
 
@@ -469,7 +469,7 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				uiBlockSetEmboss(block, UI_EMBOSSN);
 				
 				bt = uiDefIconButBitI(block, ICONTOGN, SCE_LAY_DISABLE, 0, ICON_CHECKBOX_HLT - 1,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      te->directdata, 0, 0, 0, 0, "Render this RenderLayer");
 				uiButSetFunc(bt, restrictbutton_r_lay_cb, tselem->id, NULL);
 				
@@ -483,7 +483,7 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				
 				
 				bt = uiDefIconButBitI(block, ICONTOG, passflag, 0, ICON_CHECKBOX_HLT - 1,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      layflag, 0, 0, 0, 0, "Render this Pass");
 				uiButSetFunc(bt, restrictbutton_r_lay_cb, tselem->id, NULL);
 				
@@ -492,7 +492,7 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				          SCE_PASS_INDIRECT, SCE_PASS_EMIT, SCE_PASS_ENVIRONMENT))
 				{
 					bt = uiDefIconButBitI(block, TOG, passflag, 0, (*layflag & passflag) ? ICON_DOT : ICON_BLANK1,
-					                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+					                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 					                      layflag, 0, 0, 0, 0, "Exclude this Pass from Combined");
 				}
 				uiButSetFunc(bt, restrictbutton_r_lay_cb, tselem->id, NULL);
@@ -505,12 +505,12 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				
 				uiBlockSetEmboss(block, UI_EMBOSSN);
 				bt = uiDefIconButBitI(block, ICONTOGN, eModifierMode_Realtime, 0, ICON_RESTRICT_VIEW_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(md->mode), 0, 0, 0, 0, "Restrict/Allow visibility in the 3D View");
 				uiButSetFunc(bt, restrictbutton_modifier_cb, scene, ob);
 				
 				bt = uiDefIconButBitI(block, ICONTOGN, eModifierMode_Render, 0, ICON_RESTRICT_RENDER_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(md->mode), 0, 0, 0, 0, "Restrict/Allow renderability");
 				uiButSetFunc(bt, restrictbutton_modifier_cb, scene, ob);
 			}
@@ -520,12 +520,12 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				
 				uiBlockSetEmboss(block, UI_EMBOSSN);
 				bt = uiDefIconButBitI(block, ICONTOG, BONE_HIDDEN_P, 0, ICON_RESTRICT_VIEW_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(bone->flag), 0, 0, 0, 0, "Restrict/Allow visibility in the 3D View");
 				uiButSetFunc(bt, restrictbutton_bone_cb, NULL, bone);
 				
 				bt = uiDefIconButBitI(block, ICONTOG, BONE_UNSELECTABLE, 0, ICON_RESTRICT_SELECT_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(bone->flag), 0, 0, 0, 0, "Restrict/Allow selection in the 3D View");
 				uiButSetFunc(bt, restrictbutton_bone_cb, NULL, NULL);
 			}
@@ -534,12 +534,12 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				
 				uiBlockSetEmboss(block, UI_EMBOSSN);
 				bt = uiDefIconButBitI(block, ICONTOG, BONE_HIDDEN_A, 0, ICON_RESTRICT_VIEW_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(ebone->flag), 0, 0, 0, 0, "Restrict/Allow visibility in the 3D View");
 				uiButSetFunc(bt, restrictbutton_ebone_cb, NULL, ebone);
 				
 				bt = uiDefIconButBitI(block, ICONTOG, BONE_UNSELECTABLE, 0, ICON_RESTRICT_SELECT_OFF,
-				                      (int)ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX, (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
+				                      (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX), (int)te->ys, UI_UNIT_X, UI_UNIT_Y,
 				                      &(ebone->flag), 0, 0, 0, 0, "Restrict/Allow selection in the 3D View");
 				uiButSetFunc(bt, restrictbutton_ebone_cb, NULL, NULL);
 			}
@@ -553,7 +553,7 @@ static void outliner_draw_rnacols(ARegion *ar, int sizex)
 {
 	View2D *v2d = &ar->v2d;
 
-	float miny = v2d->cur.ymin - V2D_SCROLL_HEIGHT;
+	float miny = v2d->cur.ymin;
 	if (miny < v2d->tot.ymin) miny = v2d->tot.ymin;
 
 	UI_ThemeColorShadeAlpha(TH_BACK, -15, -200);
@@ -850,7 +850,7 @@ static void outliner_draw_keymapbuts(uiBlock *block, ARegion *ar, SpaceOops *soo
 				
 				/* rna property */
 				if (kmi->ptr && kmi->ptr->data) {
-					uiDefBut(block, LABEL, 0, "(RNA property)", xstart, (int)te->ys + 1, butw2, UI_UNIT_Y - 1, &kmi->oskey, 0, 0, 0, 0, ""); xstart += butw2;
+					uiDefBut(block, LABEL, 0, "(RNA property)", xstart, (int)te->ys + 1, butw2, UI_UNIT_Y - 1, NULL, 0, 0, 0, 0, ""); xstart += butw2;
 				}
 
 				(void)xstart;
@@ -1533,13 +1533,13 @@ static void outliner_draw_struct_marks(ARegion *ar, SpaceOops *soops, ListBase *
 		/* selection status */
 		if (TSELEM_OPEN(tselem, soops))
 			if (tselem->type == TSE_RNA_STRUCT)
-				glRecti(0, *starty + 1, (int)ar->v2d.cur.xmax + V2D_SCROLL_WIDTH, *starty + UI_UNIT_Y - 1);
+				glRecti(0, *starty + 1, (int)ar->v2d.cur.xmax, *starty + UI_UNIT_Y - 1);
 
 		*starty -= UI_UNIT_Y;
 		if (TSELEM_OPEN(tselem, soops)) {
 			outliner_draw_struct_marks(ar, soops, &te->subtree, starty);
 			if (tselem->type == TSE_RNA_STRUCT)
-				fdrawline(0, (float)*starty + UI_UNIT_Y, ar->v2d.cur.xmax + V2D_SCROLL_WIDTH, (float)*starty + UI_UNIT_Y);
+				fdrawline(0, (float)*starty + UI_UNIT_Y, ar->v2d.cur.xmax, (float)*starty + UI_UNIT_Y);
 		}
 	}
 }
@@ -1608,7 +1608,7 @@ static void outliner_back(ARegion *ar)
 	ystart = UI_UNIT_Y * (ystart / (UI_UNIT_Y)) - OL_Y_OFFSET;
 	
 	while (ystart + 2 * UI_UNIT_Y > ar->v2d.cur.ymin) {
-		glRecti(0, ystart, (int)ar->v2d.cur.xmax + V2D_SCROLL_WIDTH, ystart + UI_UNIT_Y);
+		glRecti(0, ystart, (int)ar->v2d.cur.xmax, ystart + UI_UNIT_Y);
 		ystart -= 2 * UI_UNIT_Y;
 	}
 }
@@ -1619,10 +1619,8 @@ static void outliner_draw_restrictcols(ARegion *ar)
 	
 	/* background underneath */
 	UI_ThemeColor(TH_BACK);
-	glRecti((int)ar->v2d.cur.xmax - OL_TOGW,
-	        (int)ar->v2d.cur.ymin - V2D_SCROLL_HEIGHT - 1,
-	        (int)ar->v2d.cur.xmax + V2D_SCROLL_WIDTH,
-	        (int)ar->v2d.cur.ymax);
+	glRecti((int)(ar->v2d.cur.xmax - OL_TOGW),
+	        (int)(ar->v2d.cur.ymin - 1), (int)ar->v2d.cur.xmax, (int)ar->v2d.cur.ymax);
 	
 	UI_ThemeColorShade(TH_BACK, 6);
 	ystart = (int)ar->v2d.tot.ymax;
@@ -1636,22 +1634,22 @@ static void outliner_draw_restrictcols(ARegion *ar)
 	UI_ThemeColorShadeAlpha(TH_BACK, -15, -200);
 
 	/* view */
-	fdrawline(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX,
-	          ar->v2d.cur.ymax,
-	          ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX,
-	          ar->v2d.cur.ymin - V2D_SCROLL_HEIGHT);
+	sdrawline((int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX),
+	          (int)ar->v2d.cur.ymax,
+	          (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_VIEWX),
+	          (int)ar->v2d.cur.ymin);
 
 	/* render */
-	fdrawline(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX,
-	          ar->v2d.cur.ymax,
-	          ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX,
-	          ar->v2d.cur.ymin - V2D_SCROLL_HEIGHT);
+	sdrawline((int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX),
+	          (int)ar->v2d.cur.ymax,
+	          (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_SELECTX),
+	          (int)ar->v2d.cur.ymin);
 
 	/* render */
-	fdrawline(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX,
-	          ar->v2d.cur.ymax,
-	          ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX,
-	          ar->v2d.cur.ymin - V2D_SCROLL_HEIGHT);
+	sdrawline((int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX),
+	          (int)ar->v2d.cur.ymax,
+	          (int)(ar->v2d.cur.xmax - OL_TOG_RESTRICT_RENDERX),
+	          (int)ar->v2d.cur.ymin);
 }
 
 /* ****************************************************** */
@@ -1700,11 +1698,9 @@ void draw_outliner(const bContext *C)
 		// XXX this isn't that great yet...
 		if ((soops->flag & SO_HIDE_RESTRICTCOLS) == 0)
 			sizex += OL_TOGW * 3;
+		
 	}
 	
-	/* tweak to display last line (when list bigger than window) */
-	sizey += V2D_SCROLL_HEIGHT;
-	
 	/* adds vertical offset */
 	sizey += OL_Y_OFFSET;
 
diff --git a/source/blender/editors/space_outliner/outliner_intern.h b/source/blender/editors/space_outliner/outliner_intern.h
index f9fca378568..63452de18d0 100644
--- a/source/blender/editors/space_outliner/outliner_intern.h
+++ b/source/blender/editors/space_outliner/outliner_intern.h
@@ -116,8 +116,8 @@ typedef struct TreeElement {
 /* size constants */
 #define OL_Y_OFFSET 2
 
-#define OL_TOG_RESTRICT_VIEWX   (UI_UNIT_X * 3)
-#define OL_TOG_RESTRICT_SELECTX (UI_UNIT_X * 2)
+#define OL_TOG_RESTRICT_VIEWX   (UI_UNIT_X * 3.0f)
+#define OL_TOG_RESTRICT_SELECTX (UI_UNIT_X * 2.0f)
 #define OL_TOG_RESTRICT_RENDERX UI_UNIT_X
 
 #define OL_TOGW OL_TOG_RESTRICT_VIEWX
diff --git a/source/blender/editors/space_outliner/space_outliner.c b/source/blender/editors/space_outliner/space_outliner.c
index ecc09a35670..4bf88376b74 100644
--- a/source/blender/editors/space_outliner/space_outliner.c
+++ b/source/blender/editors/space_outliner/space_outliner.c
@@ -67,6 +67,17 @@ static void outliner_main_area_init(wmWindowManager *wm, ARegion *ar)
 	ListBase *lb;
 	wmKeyMap *keymap;
 	
+	/* make sure we keep the hide flags */
+	ar->v2d.scroll |= (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM);
+	ar->v2d.scroll &= ~(V2D_SCROLL_LEFT | V2D_SCROLL_TOP);	/* prevent any noise of past */
+	ar->v2d.scroll |= V2D_SCROLL_HORIZONTAL_HIDE;
+	ar->v2d.scroll |= V2D_SCROLL_VERTICAL_HIDE;
+
+	ar->v2d.align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
+	ar->v2d.keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
+	ar->v2d.keeptot = V2D_KEEPTOT_STRICT;
+	ar->v2d.minzoom = ar->v2d.maxzoom = 1.0f;
+
 	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);
 	
 	/* own keymap */
@@ -410,12 +421,6 @@ static SpaceLink *outliner_new(const bContext *UNUSED(C))
 	BLI_addtail(&soutliner->regionbase, ar);
 	ar->regiontype = RGN_TYPE_WINDOW;
 	
-	ar->v2d.scroll = (V2D_SCROLL_RIGHT | V2D_SCROLL_BOTTOM_O);
-	ar->v2d.align = (V2D_ALIGN_NO_NEG_X | V2D_ALIGN_NO_POS_Y);
-	ar->v2d.keepzoom = (V2D_LOCKZOOM_X | V2D_LOCKZOOM_Y | V2D_LIMITZOOM | V2D_KEEPASPECT);
-	ar->v2d.keeptot = V2D_KEEPTOT_STRICT;
-	ar->v2d.minzoom = ar->v2d.maxzoom = 1.0f;
-	
 	return (SpaceLink *)soutliner;
 }
 
diff --git a/source/blender/editors/space_userpref/space_userpref.c b/source/blender/editors/space_userpref/space_userpref.c
index 1ea3876f5cc..6560f218002 100644
--- a/source/blender/editors/space_userpref/space_userpref.c
+++ b/source/blender/editors/space_userpref/space_userpref.c
@@ -105,14 +105,14 @@ static SpaceLink *userpref_duplicate(SpaceLink *sl)
 /* add handlers, stuff you only do once or on area/region changes */
 static void userpref_main_area_init(wmWindowManager *wm, ARegion *ar)
 {
+	ar->v2d.flag &= ~V2D_IS_INITIALISED;
+	ar->v2d.scroll = V2D_SCROLL_RIGHT | V2D_SCROLL_VERTICAL_HIDE;
+
 	ED_region_panels_init(wm, ar);
 }
 
 static void userpref_main_area_draw(const bContext *C, ARegion *ar)
 {
-	/* this solves "vibrating UI" bug #25422 */
-	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_PANELS_UI, ar->winx, ar->winy);
-	
 	ED_region_panels(C, ar, 1, NULL, -1);
 }
 
diff --git a/source/blender/makesdna/DNA_view2d_types.h b/source/blender/makesdna/DNA_view2d_types.h
index 084496871bf..a7921be44d5 100644
--- a/source/blender/makesdna/DNA_view2d_types.h
+++ b/source/blender/makesdna/DNA_view2d_types.h
@@ -123,9 +123,9 @@ typedef struct View2D {
 	/* horizontal scrollbar */
 #define V2D_SCROLL_TOP 				(1<<2)
 #define V2D_SCROLL_BOTTOM 			(1<<3)
-	/* special hack for outliner hscroll - prevent hanging older versions of Blender */
-#define V2D_SCROLL_BOTTOM_O   		(1<<4)
-#define V2D_SCROLL_HORIZONTAL  		(V2D_SCROLL_TOP|V2D_SCROLL_BOTTOM|V2D_SCROLL_BOTTOM_O)
+
+/* UNUSED							(1<<4) */
+#define V2D_SCROLL_HORIZONTAL  		(V2D_SCROLL_TOP|V2D_SCROLL_BOTTOM)
 	/* scale markings - vertical */
 #define V2D_SCROLL_SCALE_VERTICAL	(1<<5)
 	/* scale markings - horizontal */
diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index be202a23d33..ec94501c8be 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -544,6 +544,7 @@ void WM_window_open_temp(bContext *C, rcti *position, int type)
 	}
 	
 	ED_screen_set(C, win->screen);
+	ED_screen_refresh(CTX_wm_manager(C), win); /* test scale */
 	
 	if (sa->spacetype == SPACE_IMAGE)
 		GHOST_SetTitle(win->ghostwin, IFACE_("Blender Render"));