Re: Moving point around empty overlays with 'after-text

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 07 Apr 2023 22:46:19 -0700
> From: Ash <ext0l@catgirl.ai>
> 
> https://github.com/emacs-lsp/lsp-mode/issues/3263 is a bug in lsp-mode (emacs's
> own eglot has the same bug as far as I can tell) that appears to boil down to
> the behavior of emacs overlays and after-string. That is, if your buffer looks
> like
> 
> let my_value{: Vec<i32>} = vec![0, 1, 2];
> 
> (where the curly braces indicate the after-string property of an
> overlay), you need to put your cursor *after* the overlay to
> insert text at the end of the variable name, which comes *before*
> it, and it's impossible to put your cursor immediately between
> the overlay and the preceding text. I assume the behavior the
> user desires is that you can put your cursor either immediately
> before or immediately after the overlay and insert text, and that
> pressing the left/right arrow would move you over the overlay but
> leave the actual position of point unchahnged.
> 
> My suspicion is that this isn't fixable just by setting the right text/overlay
> properties, since both the cursor locations immediately before and after the
> overlay actually correspond to the same location in the underlying string. But
> I'm not good at text property arcana. Any advice?

Did you try to use on the overlay string the 'cursor' text property
whose value is zero?