Re: Drawing UI elements behind text

[Jim Porter <jporterbugs@gmail.com>]

On 11/10/2024 10:44 AM, Eli Zaretskii wrote:
> Given the right Lisp API (which is not easy to come up with, AFAIR),
> this can be done today, because Emacs already knows how to show only a
> part of an image on a screen line.  So we need a way to tell Emacs
> "split this image's display between these N lines".

I've thought about this before. Doing it via sliced images scares me a 
bit since it would require extreme care to make sure everything lines up 
correctly. For example, what if the text has mixed font sizes resulting 
in different heights for some lines? Or what about applying text scaling?

I suppose if we deemed this feature important, we could probably address 
all of those, but I'm not sure it's worth the effort. In fact, I'm not 
sure it would be worth using this new feature to help EWW out here 
either (though that's not to say the feature isn't worthwhile 
elsewhere). I just though I'd mention it as another case that's worth at 
least a cursory look.