bug#62573: 29.0.60; Cursor color not being inverted in emacs-29

[Eli Zaretskii]

> From: Daniel Martín <mardani29@yahoo.es>
> Cc: Al Haji-Ali <abdo.haji.ali@gmail.com>,  62573@debbugs.gnu.org,
>  luangruo@yahoo.com
> Date: Sat, 01 Apr 2023 21:56:33 +0200
> 
> This bug is a regression caused by
> 07715630ad9df9cb681cbadecbaf73fc9c698061.  (Adding Po Lu to the CC.)
> 
> >From what I see, the font display refactor removed this code from
> src/nsterm.m:
> 
> -  face = FACE_FROM_ID_OR_NULL (f, phys_cursor_glyph->face_id);
> -  if (face && NS_FACE_BACKGROUND (face)
> -      == ns_index_color (FRAME_CURSOR_COLOR (f), f))
> -    {
> -      [ns_lookup_indexed_color (NS_FACE_FOREGROUND (face), f) set];
> -      hollow_color = FRAME_CURSOR_COLOR (f);
> -    }
> -  else
> 
> which seems to be responsible for the cursor color change when the
> background face color is the same as the cursor color.  I can't find
> that logic in the current code, so I think we miss it from the
> refactoring.
> 
> I've solved the bug by replicating that logic in the appropriate places,
> nsterm.m and macfont.m:

This regression should be fixed on the release branch, but the patch
you propose is quite large.  Can't we simply reinstate the removed
code, and apply the changes you propose only on master?

Thanks.