Code holiday commit:

- fix: user pref, window title was reset to 'Blender' on tab usage

- Undo history menu back:
  - name "Undo History"
  - hotkey alt+ctrl+z (alt+apple+z for mac)
  - works like 2.4x, only for global undo, editmode and particle edit.

- Menu scroll
  - for small windows or screens, popup menus now allow to display
    all items, using internal scrolling
  - works with a timer, scrolling 10 items per second when mouse 
    is over the top or bottom arrow
  - if menu is too big to display, it now draws to top or bottom, 
    based on largest available space.
  - also works for hotkey driven pop up menus.

- User pref "DPI" follows widget/layout size
  - widgets & headers now become bigger and smaller, to match 
    'dpi' font sizes. Works well to match UI to monitor size.
  - note that icons can get fuzzy, we need better mipmaps for it

1 files changed, 9 insertions, 4 deletions

diff --git a/source/blender/editors/interface/interface_intern.h b/source/blender/editors/interface/interface_intern.h
index e95b544d0c0..d185e839fdd 100644
--- a/source/blender/editors/interface/interface_intern.h
+++ b/source/blender/editors/interface/interface_intern.h
@@ -45,6 +45,7 @@ struct uiHandleButtonData;
 struct wmEvent;
 struct wmOperatorType;
 struct wmWindow;
+struct wmTimer;
 struct uiStyle;
 struct uiWidgetColors;
 struct uiLayout;
@@ -107,8 +108,8 @@ typedef enum {
 #define UI_PANEL_MINY	70
 
 /* uiBut->flag */
-#define UI_SELECT		1 /* use when the button is pressed */
-/*#define UI_MOUSE_OVER	2*/  /*UNUSED, free flag*/
+#define UI_SELECT		1	/* use when the button is pressed */
+#define UI_SCROLLED		2	/* temp hidden, scrolled away */
 #define UI_ACTIVE		4
 #define UI_HAS_ICON		8
 #define UI_TEXTINPUT	16
@@ -395,6 +396,8 @@ struct uiPopupBlockHandle {
 	void (*popup_func)(struct bContext *C, void *arg, int event);
 	void (*cancel_func)(void *arg);
 	void *popup_arg;
+	
+	struct wmTimer *scrolltimer;
 
 	/* for operator popups */
 	struct wmOperatorType *optype;
@@ -416,9 +419,11 @@ void ui_block_func_ICONTEXTROW(struct bContext *C, uiLayout *layout, void *arg_b
 struct ARegion *ui_tooltip_create(struct bContext *C, struct ARegion *butregion, uiBut *but);
 void ui_tooltip_free(struct bContext *C, struct ARegion *ar);
 
-uiBut *ui_popup_menu_memory(uiBlock *block, uiBut *but);
+uiBut *ui_popup_menu_memory(struct uiBlock *block, struct uiBut *but);
+
+float *ui_block_hsv_get(struct uiBlock *block);
+void ui_popup_block_scrolltest(struct uiBlock *block);
 
-float *ui_block_hsv_get(uiBlock *block);
 
 /* searchbox for string button */
 ARegion *ui_searchbox_create(struct bContext *C, struct ARegion *butregion, uiBut *but);