bug#34051: "X protocol error: BadMatch" on current master

[Eli Zaretskii]

> From: Yuri D'Elia <wavexx@thregr.org>
> Cc: Eli Zaretskii <eliz@gnu.org>
> Date: Wed, 16 Jan 2019 22:22:30 +0100
> 
> > Seems like bug#34051.
> >
> > If you run this under GDB with x-synchronize set to t, then post the
> > full backtrace from the crash, it would be very helpful.  (If you do,
> > please post that to 34051@debbugs.gnu.org.)
> 
> So I rebuilt emacs @ a1b7a3f2a3957a399d6c3c7bcffa07ac67da82fc (first bad
> version). Running under gdb, (x-synchronize t), and then trigger the
> issue I get to the following point:

Thanks.

> Let me know if that's enough or if I should also get those darn
> debugging symbols for X11...

Thanks, this shows the problem very clearly.  I think Alan posted a
proposed patch; could you see if it solves the problems for you?