guarding Update() on OSX not to be issued faster than 1/30 later than the last redraw

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70488 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/window_osx.cpp

@@ -2099,6 +2099,11 @@ bool wxWindowMac::MacDoRedraw( long time )
     }
 
     m_updateRegion = formerUpdateRgn;
+
+    wxNonOwnedWindow* top = MacGetTopLevelWindow();
+    if (top)
+        top->WindowWasPainted() ;
+    
     return handled;
 }