bug#52297: 29.0.50; Error in c-force-redisplay timer

[martin rudalics]

reopen 52297
quit

> Eli or Martin, is this bug still showing itself?  If so, would it be
> possible to give a more exact recipe to reproduce it (though I'm aware
> the answer to this question is probably no).

With emacs -Q pulled from master and built today (2022-02-09) I load a
file containing the following text


(custom-set-variables
 '(ediff-split-window-function 'split-window-horizontally)
 '(ediff-window-setup-function 'ediff-setup-windows-plain)
 '(initial-frame-alist (quote ((fullscreen . maximized))))
 '(tool-bar-mode nil))

(switch-to-buffer
 (find-file-noselect "~/emacs-git/trunk/src/minibuf.c"))

(defun my-diffs-revision ()
  (interactive)
  (let* ((this-file-name (buffer-file-name))
         (backend (vc-backend this-file-name))
         backup)
    (cond
     (backend
      (vc-call state this-file-name)
      (vc-file-getprop this-file-name 'vc-latest-revision)
      (require 'ediff-vers)
      (with-current-buffer (find-file-noselect this-file-name)
        (ediff-vc-internal "" "")))
     ((setq backup (file-newest-backup this-file-name))
      (ediff-buffers
       (find-file-noselect backup) (current-buffer))))))

(global-set-key [(control shift meta a)] 'my-diffs-revision)


and type C-M-S-a (the file compared here is minibuffer.c of Emacs'
master).

With debugging turned on this gets me

Debugger entered--Lisp error: (error "Font-lock trying to use keywords before 
setting th...")
  signal(error ("Font-lock trying to use keywords before setting th..."))
  error("Font-lock trying to use keywords before setting th...")
  font-lock-compile-keywords(nil)
  font-lock-fontify-keywords-region(1 112 nil)
  font-lock-default-fontify-region(1523 1532 nil)
  c-font-lock-fontify-region(1523 1532)
  c-force-redisplay(1523 1532)
  apply(c-force-redisplay (1523 1532))
  timer-event-handler([t 25091 29205 916629 nil c-force-redisplay (1523 1532) 
nil 777000 nil])

martin