mohsin kaleem <mohkale@kisara.moe> writes:

> `eldoc-echo-area-prefer-doc-buffer` is a user option added a short while
> back that lets you avoid eldoc showing in the minibuffer when an
> equivalent buffer containing the eldoc output is currently visible.
> However the current implementation only works for the current frame and
> if eldoc-doc-buffer is visible in another emacsclient frame the
> echo-area still shows eldoc messages in the current frame.

[...]

> We oould do this by modifying adding a new user-option or modifying
> the existing option and allowing a new `'all-frames` value.
>
> Thoughts?

I'd personally consider this a bug, since the first line of
eldoc-echo-area-prefer-doc-buffer's docstring says:

  Prefer ElDoc's documentation buffer if it is showing in some frame.

In which case I'd advocate for this simple fix: