The X error seems to be coming from the call to XPending. The X
libraries manual does not state that XPending can signal an X error,
but maybe this is a documentation flaw in the X manual. In any case,
try this patch; it should eliminate this particular crash.
That patch would not be correct. What the manual means is probably
that XPending can't _cause_ an error. And this error was not caused
by XPending. But XPending looks for input from the X server, so it
notices that a message indicating an error has arrived. Only the
functions that check input can detect a pending error.
The patch you wrote would be a way of ignoring the error--not just
this error, but all X errors. If we wanted to do that, the cleaner
way would be to change x_error_handler. But we don't want to do that.
Normally an X error is the result of a bug in Emacs, calling the Xlib
functions wrong. We need to track down which Xlib call actually
causes the error. If it is a bug in Emacs, we can fix it. If it is
not a bug, then we need to do x_catch_errors around that Xlib call.
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