Bug#750011: gnome-tweak-tool: Windows Scaling Not Undoable

[Alex Robbins]

I did the exact same thing on a recently-upgraded Jessie installation 
and got the exact same results.  I agree that there should be some kind 
of timeout like the one for changing display resolution, and for the 
same reason: unwittingly changing the setting to something inappropriate 
can make it very difficult to change it back to something sane.

For anyone else who ends up in this situation, I bet there's a gsettings 
command that could be run via a virtual terminal, but I don't know the 
schema or key.  Something like:
> DISPLAY=':0.0' gsettings reset org.gnome.desktop.interface scaling-factor

but replace "org.gnome.desktop.interface scaling-factor" with the right 
schema and key (because I'm pretty sure that isn't it, although it may 
look like it).  Perhaps someone more knowledgeable can elaborate (or fix 
the bug)...

Thanks,
Alex Robbins