menubar flickering... found the cause, looking for a cure...

Well, I tracked down _why_ the menubar in XEmacs/GTK is flickering so much when using 'speedbar' or 'grep'. Basically, the variable current-menubar is both buffer-local and magic. Its magic function calls MARK_MENUBAR_CHANGED, which causes the menubar to get reconstructed. No problem in and of itself, but when calling set-buffer, this causes the buffer-local variables to be evaluated, which nukes the menubar, etc. I don't think that the menubar should be invalidated just because of set-buffer, because it isn't supposed to change the buffer for more than the current command. But menubar_variable_changed() in menubar.c does not / cannot know whether the change is permanent or temporary. I couldn't find any place in lwlib where it tries to be smart about this type of thing, so either I am missing something or it is gobs faster than the GTK menubar widget at updating itself. Can anyone think of a way around this? The flicker is horrendous with speedbar. -Bill P.