bug#60585: 30.0.50; global-text-scale-adjust shrinks window (was not before)

[Gregory Heytings]

> > Jean, can you please tell us which window manager you use, which exact 
> > version it is, and with which exact revision of the Emacs repository 
> > you see that problem?
>
> I use
>
> IceWM 3.2.3, Copyright 1997-2012 Marko Macek, 2001 Mathias Hasselmann.
>
> and I have no problem whatsoever with any other window, so it is very 
> much Emacs specific.
>
> [...]
>
> ftcrhb:-ADBO-Source Code Pro-regular-normal-normal-*-17-*-*-*-m-0-iso10646-1 
> (#x2F)
>
> I can see same problem with DejaVu Sans Mono

Great, thanks for that information.  I installed IceWM 3.2.3, and now I 
can reproduce the problem (both on the release branch and on master). 
It's indeed related to the window manager, because with several other 
window managers there is no such problem.