bug#29661: 27.0.50; emacs crashing on exchange-point-and-mark

[martin rudalics]

> Thanks, it now no longer crashes there, but crashes elsewhere but looks
> to about to terminate in a more controlled manner?

IIUC what Emacs is trying to do here is to avoid the infinite loop
mentioned in etc/PROBLEMS:

  There is a long-standing bug in GTK that prevents it from recovering
  from disconnects: http://bugzilla.gnome.org/show_bug.cgi?id=85715.

It also says:

  If you need Emacs to be able to recover from closing displays, compile
  it with the Lucid toolkit instead of GTK.

So it might be interesting if Lucid (or non-toolkit) builds work around
this.

> #1  check_glyph_memory () at dispnew.c:2264
>          tail = XIL(0)

Yet another one.  I attached a new patch.

martin

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