Re: Tool bar buttons do not respond while redisplaying?

[Richard Stallman]

    If I move the mouse over one of the icons of the toolbar, I see that icon
    being "raised", as expected, but every second or so it flickers betwen
    raised and not raised.
    If I happen to click just when it flickers, the click is ignored.

    This doesn't render Emacs unusable, but it makes it feel very flaky :-(

I think it is not essential to fix this before the release.
But it would be useful to debug the problem, because there might be
a simple fix that we would want to install now.