bug#44080: 27.1; Display behavior of overlays `after-string` in resizable minibuffer frames

[martin rudalics]

> For now I updated the tag to 27.2. Let me know if anything else could
> be improved and thanks for giving me the opportunity to contribute a
> little to my favorite software :)

I think it's good to be installed now.  Eli, two questions:

- Is it OK to install this on Emacs 27?  I don't know how popular these
  minibuffers with leading or trailing overlays become, but if they do,
  it might be good to be prepared.

- Can we accept Clemens' patch without paperwork?  Many of its parts are
  slightly amended doc-strings.

Thanks, martin