These methods can't be used directly on wxPaintDC in wxGTK and it doesn't seem possible to fix this so just document this limitation. Closes #14067. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70827 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775