GNU bug report logs - #13399
24.3.50; Word-wrap can't wrap at zero-width space U-200B

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: monnier <at> iro.umontreal.ca, 13399 <at> debbugs.gnu.org
Subject: bug#13399: 24.3.50; Word-wrap can't wrap at zero-width space U-200B
Date: Sat, 12 Jan 2013 19:01:16 +0100

>> But PARTIALLY nil means to return nil if the position is only partially
>> visible.  And in this case `fit-window-to-buffer' should try to enlarge
>> the window.
>
> Should it?  It enlarges the window in line units, so the enlarged
> window will again show a partially visible line, no?

That's the clue.  The bug is in this part of `fit-window-to-buffer':

	    (if (zerop delta)
		;; Return zero if DELTA became zero in the process.
		0

The delta comes from `count-screen-lines' and that function returns the
number of lines in the buffer but NOT in canonical line units.  Removing
this conditional now seems to fix the problem for sure.

Still `fit-window-to-buffer' would benefit from a function that returned
either the pixel height needed for displaying the region or its number
of canonical line units.  Obviously, the former would be preferable when
we switch to pixel-sized windows.

martin

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