Two nice usability fixes:

- On inserting keyframes in buttons, no redraw happened
- Keyframe in icon-only buttons now draw color in background.

source/blender/editors/interface/interface_handlers.c

@@ -5002,7 +5002,8 @@ void uiContextAnimUpdate(const bContext *C)
 		for(block=ar->uiblocks.first; block; block=block->next) {
 			for(but=block->buttons.first; but; but= but->next) {
 				ui_but_anim_flag(but, (scene)? scene->r.cfra: 0.0f);
-
+				ED_region_tag_redraw(ar);
+				
 				if(but->active)
 					activebut= but;
 				else if(!activebut && (but->flag & UI_BUT_LAST_ACTIVE))

source/blender/editors/interface/interface_widgets.c

@@ -2350,6 +2350,20 @@ static void widget_swatch(uiBut *but, uiWidgetColors *wcol, rcti *rect, int stat
 	
 }
 
+static void widget_icon_has_anim(uiBut *but, uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
+{
+	if(state & (UI_BUT_ANIMATED|UI_BUT_ANIMATED_KEY|UI_BUT_DRIVEN|UI_BUT_REDALERT)) {
+		uiWidgetBase wtb;
+	
+		widget_init(&wtb);
+		wtb.outline= 0;
+		
+		/* rounded */
+		round_box_edges(&wtb, 15, rect, 10.0f);
+		widgetbase_draw(&wtb, wcol);
+	}	
+}
+
 
 static void widget_textbut(uiWidgetColors *wcol, rcti *rect, int state, int roundboxalign)
 {
@@ -2693,7 +2707,7 @@ static uiWidgetType *widget_type(uiWidgetTypeEnum type)
 			
 			/* specials */
 		case UI_WTYPE_ICON:
-			wt.draw= NULL;
+			wt.custom= widget_icon_has_anim;
 			break;
 			
 		case UI_WTYPE_SWATCH: