Apply fix for #15734: wxRichTextCtrl: A floating wxRichTextTable's cells aren't drawn (dghart)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75321 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775