bug#21380: 25.0.50; GTK-induced segfault when scheduling timer from window-configuration-change-hook

[martin rudalics]

> So maybe we should introduce a special copy_sequence_no_quit function
> that never calls QUIT, and then use it for copying the timer lists.

Yes.

> Timer lists are never too long, so that shouldn't be a problem.

Why do you think that copy_sequence_no_quit would be slower than
Fcopy_sequence?  The problem of copy_sequence_no_quit would be with
circularity, not with length.

martin