bug#65568: 30.0.50; mode-line-format-right-align can make part of the modeline content disappear when eldoc is enabled

[Eli Zaretskii]

> Date: Sun, 27 Aug 2023 13:18:56 -0300
> From:  John Task via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Steps to reproduce:
> 
> + Start Emacs with emacs -Q
> 
> + Evaluate the following code:
> 
>     (setq-default mode-line-format
>                   '("%e" mode-line-front-space
>                     (:propertize
>                      ("" mode-line-mule-info mode-line-client 
> mode-line-modified
>                       mode-line-remote)
>                      display (min-width (5.0)))
>                     mode-line-frame-identification
>                     mode-line-buffer-identification
>                     "   " mode-line-position
>                     (vc-mode vc-mode) "  "
>                     ;; Right align
>                     mode-line-format-right-align
>                     mode-line-modes mode-line-misc-info mode-line-end-spaces))
> 
> + Type anything that triggers eldoc while in the minibuffer.  For instance:
> 
>     M-: ( c d
> 
>     [Wait for eldoc to appear]
> 
> + Quit with C-g
> 
> Note that the right half of the modeline (which contains the major
> mode) is no longer displayed.  It won't come back, not even with M-:
> (force-mode-line-update) RET.  However, this only affects the current
> buffer.

Hugo, could you please look into this?