2.5:

* Default panel zoom level user preference, when creating
  new button windows or pressing home-key to reset. Patch
  by Matt D., thanks!

source/blender/editors/interface/interface.c

@@ -1615,7 +1615,7 @@ uiBlock *uiBeginBlock(const bContext *C, ARegion *region, const char *name, shor
 	block= MEM_callocN(sizeof(uiBlock), "uiBlock");
 	block->active= 1;
 	block->dt= dt;
-	block->evil_C= C; // XXX
+	block->evil_C= (void*)C; // XXX
 	BLI_strncpy(block->name, name, sizeof(block->name));
 
 	if(region)

source/blender/editors/interface/interface_style.c

@@ -89,6 +89,8 @@ static uiStyle *ui_style_new(ListBase *styles, const char *name)
 	BLI_addtail(styles, style);
 	BLI_strncpy(style->name, name, MAX_STYLE_NAME);
 	
+	style->panelzoom= 1.0;
+
 	style->paneltitle.uifont_id= UIFONT_DEFAULT;
 	style->paneltitle.points= 13;
 	style->paneltitle.shadow= 5;

source/blender/editors/interface/view2d.c

@@ -155,7 +155,8 @@ static void view2d_masks(View2D *v2d)
 void UI_view2d_region_reinit(View2D *v2d, short type, int winx, int winy)
 {
 	short tot_changed= 0;
-	
+	uiStyle *style= U.uistyles.first;
+
 	/* initialise data if there is a need for such */
 	if ((v2d->flag & V2D_IS_INITIALISED) == 0) {
 		/* set initialised flag so that View2D doesn't get reinitialised next time again */
@@ -250,7 +251,11 @@ void UI_view2d_region_reinit(View2D *v2d, short type, int winx, int winy)
 				v2d->tot.ymax= 0.0f;
 				v2d->tot.ymin= -winy;
 
-				v2d->cur= v2d->tot;
+				v2d->cur.xmin= 0.0f;
+				v2d->cur.xmax= winx*style->panelzoom;
+
+				v2d->cur.ymax= 0.0f;
+				v2d->cur.ymin= -winy*style->panelzoom;
 			}
 				break;
 

source/blender/editors/interface/view2d_ops.c

@@ -1273,6 +1273,7 @@ void VIEW2D_OT_scroller_activate(wmOperatorType *ot)
 
 static int reset_exec(bContext *C, wmOperator *op)
 {
+	uiStyle *style= U.uistyles.first;
 	ARegion *ar= CTX_wm_region(C);
 	View2D *v2d= &ar->v2d;
 	int winx, winy;
@@ -1283,26 +1284,26 @@ static int reset_exec(bContext *C, wmOperator *op)
 
 	v2d->cur.xmax= v2d->cur.xmin + winx;
 	v2d->cur.ymax= v2d->cur.ymin + winy;
-
+	
 	/* align */
 	if(v2d->align) {
 		/* posx and negx flags are mutually exclusive, so watch out */
 		if ((v2d->align & V2D_ALIGN_NO_POS_X) && !(v2d->align & V2D_ALIGN_NO_NEG_X)) {
 			v2d->cur.xmax= 0.0f;
-			v2d->cur.xmin= v2d->winx;
+			v2d->cur.xmin= v2d->winx*style->panelzoom;
 		}
 		else if ((v2d->align & V2D_ALIGN_NO_NEG_X) && !(v2d->align & V2D_ALIGN_NO_POS_X)) {
-			v2d->cur.xmax= v2d->cur.xmax - v2d->cur.xmin;
+			v2d->cur.xmax= (v2d->cur.xmax - v2d->cur.xmin)*style->panelzoom;
 			v2d->cur.xmin= 0.0f;
 		}
 
 		/* - posx and negx flags are mutually exclusive, so watch out */
 		if ((v2d->align & V2D_ALIGN_NO_POS_Y) && !(v2d->align & V2D_ALIGN_NO_NEG_Y)) {
 			v2d->cur.ymax= 0.0f;
-			v2d->cur.ymin= -v2d->winy;
+			v2d->cur.ymin= -v2d->winy*style->panelzoom;
 		}
 		else if ((v2d->align & V2D_ALIGN_NO_NEG_Y) && !(v2d->align & V2D_ALIGN_NO_POS_Y)) {
-			v2d->cur.ymax= v2d->cur.ymax - v2d->cur.ymin;
+			v2d->cur.ymax= (v2d->cur.ymax - v2d->cur.ymin)*style->panelzoom;
 			v2d->cur.ymin= 0.0f;
 		}
 	}

source/blender/makesdna/DNA_userdef_types.h

@@ -92,6 +92,8 @@ typedef struct uiStyle {
 	uiFontStyle widgetlabel;
 	uiFontStyle widget;
 	
+	float panelzoom;
+	
 	short minlabelchars;	/* in characters */
 	short minwidgetchars;	/* in characters */
 
@@ -103,7 +105,7 @@ typedef struct uiStyle {
 	short panelspace;
 	short panelouter;
 
-	short pad[3];
+	short pad[1];
 } uiStyle;
 
 typedef struct uiWidgetColors {

source/blender/makesrna/intern/rna_userdef.c

@@ -174,6 +174,10 @@ static void rna_def_userdef_theme_ui_style(BlenderRNA *brna)
 	RNA_def_struct_sdna(srna, "uiStyle");
 	RNA_def_struct_ui_text(srna, "Style", "Theme settings for style sets.");
 	
+	prop= RNA_def_property(srna, "panelzoom", PROP_FLOAT, PROP_NONE);
+	RNA_def_property_range(prop, 0.5, 2.0);
+	RNA_def_property_ui_text(prop, "Panel Zoom", "Default zoom level for panel areas.");
+	
 	prop= RNA_def_property(srna, "paneltitle", PROP_POINTER, PROP_NEVER_NULL);
 	RNA_def_property_pointer_sdna(prop, NULL, "paneltitle");
 	RNA_def_property_struct_type(prop, "ThemeFontStyle");