Need to allow wxMemoryDC's at any time. (It derives from wxPaint event so the 2nd half of the test catches that.)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@53583 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/renderer.cpp

@@ -33,10 +33,12 @@
 // check if we're currently in a paint event
 inline bool wxInPaintEvent(wxWindow* win, wxDC& dc)
 {
+    return 
 #if wxMAC_USE_CORE_GRAPHICS
-    return ( win->MacGetCGContextRef() != NULL );
+        win->MacGetCGContextRef() != NULL ||
 #else
-    return dc.IsKindOf( CLASSINFO(wxPaintDC) );
+         // wxMemoryDC derives from wxPaintDC so it is okay too.
+        dc.IsKindOf( CLASSINFO(wxPaintDC) ); 
 #endif
 }