added a function CanvasItem.get_item_and_children_rect() , fixes #4738

scene/2d/canvas_item.cpp

@@ -1042,7 +1042,9 @@ void CanvasItem::_bind_methods() {
 	ObjectTypeDB::bind_method(_MD("edit_rotate","degrees"),&CanvasItem::edit_rotate);
 
 	ObjectTypeDB::bind_method(_MD("get_item_rect"),&CanvasItem::get_item_rect);
+	ObjectTypeDB::bind_method(_MD("get_item_and_children_rect"),&CanvasItem::get_item_and_children_rect);
 	//ObjectTypeDB::bind_method(_MD("get_transform"),&CanvasItem::get_transform);
+
 	ObjectTypeDB::bind_method(_MD("get_canvas_item"),&CanvasItem::get_canvas_item);
 
 	ObjectTypeDB::bind_method(_MD("is_visible"),&CanvasItem::is_visible);
@@ -1195,6 +1197,23 @@ int CanvasItem::get_canvas_layer() const {
 		return 0;
 }
 
+
+Rect2 CanvasItem::get_item_and_children_rect() const {
+
+	Rect2 rect = get_item_rect();
+
+
+	for(int i=0;i<get_child_count();i++) {
+		CanvasItem *c=get_child(i)->cast_to<CanvasItem>();
+		if (c) {
+			Rect2 sir = c->get_transform().xform(c->get_item_and_children_rect());
+			rect = rect.merge(sir);
+		}
+	}
+
+	return rect;
+}
+
 CanvasItem::CanvasItem() : xform_change(this) {
 
 

scene/2d/canvas_item.h

@@ -240,6 +240,8 @@ public:
 	virtual Matrix32 get_global_transform() const;
 	virtual Matrix32 get_global_transform_with_canvas() const;
 
+	Rect2 get_item_and_children_rect() const;
+
 	CanvasItem *get_toplevel() const;
 	_FORCE_INLINE_ RID get_canvas_item() const { return canvas_item; }
 

scene/gui/control.cpp

@@ -447,7 +447,7 @@ void Control::_notification(int p_notification) {
 
 
 				Node *parent=this; //meh
-				Node *parent_control=NULL;
+				Control *parent_control=NULL;
 				bool subwindow=false;
 
 				while(parent) {
@@ -463,8 +463,9 @@ void Control::_notification(int p_notification) {
 						break;
 					}
 
-					if (parent->cast_to<Control>()) {
-						parent_control=parent->cast_to<Control>();
+					parent_control=parent->cast_to<Control>();
+
+					if (parent_control) {
 						break;
 					} else if (ci) {