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 20:34:57 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> 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.
> 
> Yes.  The question was how to tell apart the situation where the rows
> don't extend to ZV because of that bug, and when they don't extend to ZV
> legitimately (since the tooltip is too small.)

By "legitimately", you mean because of the restrictions in
x-max-tooltip-size?  I guess we should compare the values of
x-max-tooltip-size with their default values.