bug#68547: [PATCH] ; Fix 'mode-line-format-right-align' with ElDoc

[Eshel Yaron via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

João Távora <joaotavora@gmail.com> writes:

> On Sun, Jan 21, 2024 at 8:34 AM Eshel Yaron <me@eshelyaron.com> wrote:
>
>> I tried your new patch, and it works well, AFAICT.  Two suggestions:
>>
>> 1. This patch omits a space that would appear before the info on the
>>    mode line.  I like that bit of padding, so I suggest restoring it :)
>
> OK.
>
>> 2. In `eldoc--message-in-mode-line`, `add-hook` and `remove-hook` can be
>>    called with non-nil LOCAL argument to further localize the effect,
>>    although I'm not sure that makes a real difference in practice.
>
> I tend to think it would break your pathological use cases of
> shuffling buffers above the minibuffer while it is ongoing, no?
> Two or more separate transient cleanup lambdas can appear
> in those cases, no?

Yes, you're right.  My suggestion was based on a wrong assumption that
these calls take place with the minibuffer as the current buffer.

If I say something like `(with-current-buffer minibuf ...)` around the
`add-hook` and `remove-hook` calls, and make these calls change the
local value of `minibuffer-exit-hook`, that seems to work nicely.  In
particular, this avoids calling the cleanup lambda when you exit a
nested minibuffer (e.g. `M-: (foo bar) M-x baz RET RET`).  WDYT?