Re: "Final" version of tty child frames

[Gerd Möllmann]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Wed, 15 Jan 2025 18:01:52 +0100
>> Cc: gerd.moellmann@gmail.com, jared@finder.org, emacs-devel@gnu.org
>> From: martin rudalics <rudalics@gmx.at>
>> 
>>  >> Back to redisplay optimization.
>>  >
>>  > Does this mean you've solved the problem in set_cursor_from_row?
>>  > Because that problem, if it's real, has nothing to do with redisplay
>>  > optimizations.
>> 
>> Turning the table: When I insert a character in the row at hand the
>> problem doesn't occur.  When I just move point it does occur.  Why?
>
> Sheer luck?

It's something simple:

When inserting a character, a desired glyph row is built. That row can
be used to set the cursor.

When just moving the cursor, no desired glyphs are produced, and the
current glyph row is used, which can contain glyphs from child frames.