martin rudalics <rudalics@gmx.at> writes:

> What, in a nutshell, would these 'eldoc-display-functions' be (sorry but
> my master on this system is in an inconsistent state and I don't want to
> resolve conflicts when pulling anything into it)?

Hi, Martin

I just pushed a cleaned-up improved version of the
eldoc-display-functions branch.

To git.sv.gnu.org:/srv/git/emacs.git
 * [new branch]            scratch/eldoc-display-functions -> scratch/eldoc-display-functions

After a cursory reading of it, I managed to adapt your eldoc-tooltip.el
library to use it.  I didn't make many changes and didn't test it
thoroughly, but I believe the adaptation works nicely.  I attach it as
file eldoc-tooltip-joao.el.  It needs the eldoc-display-functions
branch, obviously, which I will test for a few more than, then push to
master (it's a straightforward planned change and seems pretty stable).

To make it work pre-emacs-28 (where no eldoc-documentation-functions or
eldoc-display-functions exist) shouldn't be extremely hard, but I didn't
make that effort.  Obviously it won't work with asynchronous doc
backends there, but as it didn't before that's not new.

I also include Yuan Fu in this conversation, the author of the
aforementioned eldoc-box.el extension.  It seems both of you are working
in very similar funcionality.  Maybe some of it might make it into emacs
proper as one or more elements that a user can add to
eldoc-display-functions.

João