Added PaintAboveContent function for drawing on top of text (#12176)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64735 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextctrl.cpp

@@ -409,6 +409,9 @@ void wxRichTextCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
 
         dc.DestroyClippingRegion();
 
+        // Other user defined painting after everything else (i.e. all text) is painted
+        PaintAboveContent(dc);
+
 #if wxRICHTEXT_USE_OWN_CARET
         if (GetCaret()->IsVisible())
         {