bug#54051: 29.0.50; latest master build with lucid crashes

[Po Lu]

Po Lu <luangruo@yahoo.com> writes:

> This configure event is wrong: it specifies a width and height of zero,
> which are invalid under X.  Then, the shell widget tries to reconfigure
> its window to those invalid dimensions, which causes the crash.
>
> The `send_event' field indicates that this event was sent by another
> client and not the X server after window configuration (since we don't
> send ConfigureNotify events to ourself anywhere in Emacs).
>
> Please try to find the program that is sending these events.  It could
> be a badly behaved window manager, for example.

But since it's difficult to locate that program, I tried to work around
the problem on master.  Please see if that fixed it.