bug#18720: 25.0.50; `set-frame-size' reduces height instead of increases it, when set to larger value

bug#18720: 25.0.50; `set-frame-size' reduces height instead of increases it, when set to larger value

[Drew Adams]

emacs -Q

Resize the frame using the mouse, so that the menu bar extends (is
wrapped) to be 3 lines.

(frame-height) ; ==> call it N

(set-frame-height nil (1+ N))

The frame height is *reduced* by one, not increased by one.

If the menu bar is wrapped to only 2 lines then the bug does not occur.

It does not matter what value option `frame-resize-pixelwise' has.
(And it should not matter - frame resizing should work regardless of its
value, with the only difference being the granularity - not the
direction - of resizing).

In GNU Emacs 25.0.50.1 (i686-pc-mingw32)
 of 2014-10-06 on LEG570
Bzr revision: 118063 monnier@iro.umontreal.ca-20141006174756-y7ha091r491l1ijw
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking=yes,glyphs 'CFLAGS=-O0 -g3'
 CPPFLAGS=-DGLYPH_DEBUG=1'

bug#18720: 25.0.50; `set-frame-size' reduces height instead of increases it, when set to larger value

[martin rudalics]

 > emacs -Q
 >
 > Resize the frame using the mouse, so that the menu bar extends (is
 > wrapped) to be 3 lines.
 >
 > (frame-height) ; ==> call it N
 >
 > (set-frame-height nil (1+ N))
 >
 > The frame height is *reduced* by one, not increased by one.

Should be fixed with revision 118172 on trunk.

 > If the menu bar is wrapped to only 2 lines then the bug does not occur.

With a two lines menu bar here the frame height was reduced by one as
well.

 > It does not matter what value option `frame-resize-pixelwise' has.
 > (And it should not matter - frame resizing should work regardless of its
 > value, with the only difference being the granularity - not the
 > direction - of resizing).

This option is completely unrelated to the problem at hand.

Thanks, martin

bug#18720: 25.0.50; `set-frame-size' reduces height instead of increases it, when set to larger value

[Drew Adams]

> Should be fixed with revision 118172 on trunk.
> 
>  > If the menu bar is wrapped to only 2 lines then the bug does not
>  > occur.
> 
> With a two lines menu bar here the frame height was reduced by one
> as well.

OK; that's in fact what I see in my setup.  But I could not repro it
from emacs -Q, for some reason.

(I replied to your msg about #15174 before reading this.  Great that
both are fixed. Thx.)

bug#18720: 25.0.50; `set-frame-size' reduces height instead of increases it, when set to larger value

[martin rudalics]

>> Should be fixed with revision 118172 on trunk.

Bug closed.

Thanks, martin