bug#32736: bug#34715: bug#32736: 26; Bind `C-x 5 2' to `clone-frame' by default

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 34715@debbugs.gnu.org,  32736@debbugs.gnu.org
> Date: Thu, 02 Sep 2021 10:57:24 +0200
> 
> >> > And the faces aren't copied, I think, they reference the same faces
> >> > the original frame had.
> >> 
> >> Right -- I don't really know how the face/frame stuff actually works.
> >> If it was a very general problem, then surely we'd stumble across this
> >> whenever we make a new frame.  But the bug seems to manifest only on
> >> terminal frames -- when we change the background mode.
> >
> > That's true, but it doesn't mean we don't have a deeper problem.
> 
> True.  I'll continue to debug this, but won't have time today, I
> think...  If you want to have a look meanwhile, please go ahead.  :-)
> It reproduces easily, and the bug seems to be caused by something called
> by `frame-set-background-mode', but that may or may not be correct
> (perhaps it's just doing something that triggers the real problem caused
> somewhere else).

I think I fixed this.  The problem was indeed with letting the new
frame manipulate a separate set of faces: we arrange for that in
make-terminal-frame, but we were doing that a tad too late.