bug#17077: 24.4.50; regression: `set-frame-size' results in wrong frame size

[martin rudalics]

> In previous builds and releases, including a build as recent as
> 2014-03-11, (set-frame-size 75 64)

(set-frame-size nil 75 64)

> ends up with these frame parameters
> (using my setup, for a special-display frame):
>
>   (width . 75) ; <==============================
>   (height . 62)
...
>   (width . 74) ; <==============================
>   (height . 64)
...
>
> I don't care so much about the height.  What is definitely wrong is
> diminishing the specified width (75) by one.  The widest line in the
> buffer is 75 chars wide, so fitting the frame to a width of 74 does
> not cut the mustard.
>
> Depending on the char (font) size, sometimes the frame fitting still
> works as it should.  But for other sizes it has this
> one-char-less-than-required-width failing.  E.g., this is the case
> also for font "-outline-Lucida
> Console-normal-normal-normal-mono-10-*-*-*-c-*-iso8859-1" (same font,
> with size 10).

Should be fixed with revision 116849 on the emacs-24 release branch.

Please also check whether bug#16923 is affected.  The "fix" that caused
the present bug was a stab in direction of fixing 16923.

Thanks, martin