Fix for layout in wxGTK when showing or hiding a toolbar

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@49740 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/framecmn.cpp

@@ -174,6 +174,13 @@ void wxFrameBase::SendSizeEvent()
     wxSizeEvent event( GetSize(), GetId() );
     event.SetEventObject( this );
     GetEventHandler()->AddPendingEvent( event );
+
+#ifdef __WXGTK__
+    // SendSizeEvent is typically called when a toolbar is shown
+    // or hidden, but sending the size event alone is not enough
+    // to trigger a full layout.
+    ((wxFrame*)this)->GtkOnSize();
+#endif
 }