fix [#30087] operator_context is different for popup and submenu's *TODO, after 2.62*

having context different for menu vs submenu is quite confusing, now they are both: WM_OP_INVOKE_REGION_WIN
this changes WM_menu_invoke behavior.

source/blender/editors/interface/interface_layout.c

@@ -1450,6 +1450,11 @@ static void ui_item_menutype_func(bContext *C, uiLayout *layout, void *arg_mt)
 
 	menu.type = mt;
 	menu.layout = layout;
+
+	if (G.debug & G_DEBUG_WM) {
+		printf("%s: opening menu \"%s\"\n", __func__, mt->idname);
+	}
+
 	mt->draw(C, &menu);
 }