bug#56372: 29.0.50; [PATCH] Avoid BadMatch X11 error

[po lu]

Po Lu <luangruo@yahoo.com> writes:

> x_ignore_errors_for_next_request and x_stop_ignoring_errors don't call
> XSync (unlike the usual error handling and checking functions) -- they
> only make a note of the range of requests made inside them, so the
> x_error_handler knows that it should ignore the error.  This is done for
> speed, since syncing is slow, especially over connections with high
> latency.

I reproduced the bug with a GTK build.  It should be fixed now, please
test.