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, 5 insertions, 4 deletions

diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index d6988aa9618..1a26079800c 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -35,6 +35,7 @@
 #define UI_INTERFACE_H
 
 #include "RNA_types.h"
+#include "DNA_userdef_types.h"
 
 /* Struct Declarations */
 
@@ -100,8 +101,8 @@ typedef struct uiLayout uiLayout;
 #define UI_BLOCK_RET_1			4		/* XXX 2.5 not implemented */
 #define UI_BLOCK_NUMSELECT		8
 /*#define UI_BLOCK_ENTER_OK		16*/ /*UNUSED*/
-/*#define UI_BLOCK_NOSHADOW		32*/ /*UNUSED*/
-/*#define UI_BLOCK_UNUSED			64*/ /*UNUSED*/
+#define UI_BLOCK_CLIPBOTTOM		32
+#define UI_BLOCK_CLIPTOP		64
 #define UI_BLOCK_MOVEMOUSE_QUIT	128
 #define UI_BLOCK_KEEP_OPEN		256
 #define UI_BLOCK_POPUP			512
@@ -622,8 +623,8 @@ void UI_exit(void);
 #define UI_LAYOUT_MENU			2
 #define UI_LAYOUT_TOOLBAR		3
  
-#define UI_UNIT_X				20
-#define UI_UNIT_Y				20
+#define UI_UNIT_X				U.widget_unit
+#define UI_UNIT_Y				U.widget_unit
 
 #define UI_LAYOUT_ALIGN_EXPAND	0
 #define UI_LAYOUT_ALIGN_LEFT	1