bug#71866: 30.0.50; [macOS] Cursor hiding char behind it with certain theme customization

[Eli Zaretskii]

> Date: Wed, 24 Jul 2024 03:48:22 +0300
> Cc: alan@idiocy.org, 71866@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 23/07/2024 14:19, Eli Zaretskii wrote:
> >>
> >> TBF in my custom config I see a more advanced version of this (many/most
> >> characters become blank under cursor after switching to some secondary
> >> frame) - but still that doesn't seem to happen in non-selected frames.
> > That sounds like clipping to me.  (It should be followed by drawing in
> > the clipped region, but for some reason isn't.)  Emacs sometimes clips
> > and clears a region around the cursor if it thinks redrawing the
> > cursor will affect neighboring characters.
> 
> Just to clarify: in each of those cases only one char is blanked at a 
> time

Then I don't understand what you mean by "many/most characters become
blank under cursor".  It seems to contradict what you say now: that
"only one char is blanked".