bug#56561: 29.0.50; Infloop in try_window

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: mwd@md5i.com,  56561@debbugs.gnu.org
> Date: Sat, 16 Jul 2022 19:07:26 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > That is true.  Which part of detecting the above situation sounds
> > problematic to you?  I'm asking because I'm uncertain what should I
> > explain in this regard.
> 
> The problem is how to detect that the glyph matrix is indeed too small
> to fit all of the tooltip text, and not too small due to the bug being
> triggered?

Which bug? the one which started this discussion? that's the idea of
looking at ends_at_zv_p flag of the rows in the matrix, after
try_window returns.