bug#74274: [PATCH] Revert part of d3f8ed730f to avoid segmentation fault

[Gerd Möllmann]

qijian gong <gongqijian@gmail.com> writes:

> Gerd Möllmann <gerd.moellmann@gmail.com>于2024年11月9日 周六下午12:15写道：
>
>  Do I understand this right, that the advice you add to
>  tty-tip-compute-position only serves the purpose of being able to pop up
>  a tip frame early, when mouse-position doesn't really have a position to
>  report? Or does it also serve another purpose?
>
> Yes, that's correct, there is no other purpose. It seems
> mouse-position doesn't really have a position until the mouse was
> moved by user.

Ok, thanks.

I think I know what this is. It's the very particular case of the very
first redisplay + presence of a child freame, which copies glyphs from a
current matrix that is still clear, i.e. zeroed, so that glyph::frame
is zero and so on.

I wonder a bit - how did you come up with such a test case? :-)
Did you perhaps see this happening elsewhere? That would be interesting.