to determine the rect to clear. Also added CocoaUnapplyTransformations() to bring the coordinate system back into Cocoa coordinates for those cases such as Clear() where it makes more sense. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31440 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775