🚀 go-pugleaf

In GNU Emacs 19.25.1 of Thu Jun  2 1994 on penelope (sparc-sun-sunos4.1.3C)
(with X toolkit)

GNU Emacs 19.25.94.1 (sparc-sun-sunos4.1.3C, X toolkit) of Thu Aug 18 1994 on penelope

Though window-end is not exactly reliable in Emacs 19.25, it is worse (and
now window-start also does not work) in Emacs 19.25.94.

Try this in both versions:

% emacs -q

In *scratch*, evaluate:

(set 'post-command-hook
     '(lambda ()
	(sit-for 0)
	(message "Buffer %s is %d to %d, window is %d to %d" (buffer-name)
		 (point-min) (point-max) (window-start) (window-end))))

Then visit a file thus:

M-. font-lock-mode RET .../emacs-19.25.94/lisp/ RET

For 19.25 the message in the minibuffer is the correct:

"Buffer font-lock.el is 1 to 28758, window is 12080 to 12964"

For 19.25.94:

"Buffer font-lock.el is 1 to 28758, window is 1 to 28758"

I can only guess that the call of prepare_menu_bars from `sit-for' is the
source of the bug.  Since `sit-for' causes a redisplay, there really
should be valid values for these functions.

Simon.