> From: Alex Bennée <alex.ben...@linaro.org>
> Cc: monn...@iro.umontreal.ca, 23...@debbugs.gnu.org, rpl...@gmail.com, 
> jwieg...@gmail.com, nljlistb...@gmail.com, m...@lunaryorn.com
> Date: Tue, 19 Jul 2016 18:45:44 +0100
>   ;; Save and restore the match data, as recommended in (elisp)Change Hooks
>   (save-match-data
>     (when flycheck-mode
>       ;; The buffer was changed, thus clear the idle timer
>       (flycheck-clear-idle-change-timer)
>       (if (string-match-p (rx "\n") (buffer-substring beg end))
>           (flycheck-buffer-automatically 'new-line 'force-deferred)
>         (setq flycheck-idle-change-timer
>               (run-at-time flycheck-idle-change-delay nil
>                            #'flycheck-handle-idle-change))))))
> However it doesn't look as though it tweaks the buffer until idle timer
> has run. Weird....

Tweaking the buffer is not what causes the problem.  It's the call to
save-match-data itself.  It doesn't matter at all what the code inside
save-match-data does.

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