> From: João Távora <joaotavora@gmail.com>
> Date: Sat, 16 Jun 2018 18:24:02 +0100
>
> $ ./emacs-master/src/emacs -Q
>
> Eval in the scratch buffer
>
> (defun process-making-dummy-backend (report-fn &rest args)
> (make-process :name "dummy" :command '("echo"))
> (funcall report-fn nil))
>
> (setq flymake-diagnostic-functions '(process-making-dummy-backend))
>
> (flymake-mode)
>
> Now start typing something like this
>
> (with-current-buffer
>
> In Emacs 26.1 the arglist of with-current-buffer is displayed in the
> mode-line.
>
> In a recent master it is immediately cleared after the dummy flymake
> handler kicks in, which is bug. I think this started happening recently
> but I dont have the time to bisect it.
I think it's another manifestation of bug#31855.