Added wxTopLevelWindow::HasFocus() as discussed.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29398 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/toplevel.cpp

@@ -1067,4 +1067,13 @@ bool wxTopLevelWindowGTK::SetShape(const wxRegion& region)
     return do_shape_combine_region(window, region);
 }
 
+bool wxTopLevelWindowGTK::HasFocus()
+{
+#ifdef __WXGTK20__
+    return GTK_WINDOW( m_widget )->has_toplevel_focus;
+#else
+    return ( wxGetTopLevelParent(FindFocus()) = this );
+#endif
+}
+
 // vi:sts=4:sw=4:et