Preferences: fit a little better when opened in place of properties editor.

release/scripts/startup/bl_ui/space_userpref.py

@@ -35,6 +35,10 @@ class USERPREF_HT_header(Header):
 
         layout.template_header()
 
+        layout.separator_spacer()
+
+        layout.operator("wm.save_userpref")
+
 
 class USERPREF_PT_navigation_bar(Panel):
     bl_label = "Preferences Navigation"
@@ -60,6 +64,15 @@ class USERPREF_PT_save_preferences(Panel):
     bl_region_type = 'EXECUTE'
     bl_options = {'HIDE_HEADER'}
 
+    @classmethod
+    def poll(cls, context):
+        # Hide when header is visible
+        for region in context.area.regions:
+            if region.type == 'HEADER' and region.height <= 1:
+                return True
+
+        return False
+
     def draw(self, _context):
         layout = self.layout
         layout.operator_context = 'EXEC_AREA'

source/blender/editors/include/UI_interface.h

@@ -226,6 +226,7 @@ enum {
 #define UI_PANEL_WIDTH          340
 #define UI_COMPACT_PANEL_WIDTH  160
 #define UI_NAVIGATION_REGION_WIDTH UI_COMPACT_PANEL_WIDTH
+#define UI_NARROW_NAVIGATION_REGION_WIDTH 100
 
 #define UI_PANEL_CATEGORY_MARGIN_WIDTH (U.widget_unit * 1.0f)
 

source/blender/editors/space_userpref/space_userpref.c

@@ -53,7 +53,7 @@
 
 /* ******************** default callbacks for userpref space ***************** */
 
-static SpaceLink *userpref_new(const ScrArea *UNUSED(area), const Scene *UNUSED(scene))
+static SpaceLink *userpref_new(const ScrArea *area, const Scene *UNUSED(scene))
 {
 	ARegion *ar;
 	SpaceUserPref *spref;
@@ -76,6 +76,11 @@ static SpaceLink *userpref_new(const ScrArea *UNUSED(area), const Scene *UNUSED(
 	ar->regiontype = RGN_TYPE_NAV_BAR;
 	ar->alignment = RGN_ALIGN_LEFT;
 
+	/* Use smaller size when opened in area like properties editor. */
+	if (area->winx && area->winx < 3.0f * UI_NAVIGATION_REGION_WIDTH * UI_DPI_FAC) {
+		ar->sizex = UI_NARROW_NAVIGATION_REGION_WIDTH;
+	}
+
 	/* execution region */
 	ar = MEM_callocN(sizeof(ARegion), "execution region for userpref");