Remove wxPGClipperWindow, use wxBORDER_NONE instead of wxNO_BORDER

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56055 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/propgrid/propgrid.cpp

@@ -4789,8 +4789,6 @@ bool wxPropertyGrid::OnMouseChildCommon( wxMouseEvent &event, int* px, int *py )
     int x, y;
     event.GetPosition(&x,&y);
 
-    AdjustPosForClipperWindow( topCtrlWnd, &x, &y );
-
     int splitterX = GetSplitterPosition();
 
     wxRect r = topCtrlWnd->GetRect();