Hello, I'm following up on a bug started in
https://github.com/joaotavora/eglot/issues/445.

In the latest ElDoc, when the *eldoc* buffer is showing a lenghty
docstrings for some situation in a source buffer, switching to that
buffer scrolling around, then switching back to the same position in the
source buffer will lead to that very documentation being re-requested,
ultimately undoing the scrolling work done previously by the user.

The attached patch prevents needless, superfluous doc requests when the
requester's state is found to be identical to the state recorded in a
visible *eldoc* buffer.

These kinds of situation must be taken into account when redesigning the
mechanism for allowing multiple outlets for documentation.

For now, the patch should fix the situation.  Felicián, please try it
out.  Notice that it probably needs the Emacs master version of eldoc.el
(where, BTW, I have already fixed the other bug you report in the Github
issue).

João