bug#46827: Broken initial size of GTK3 frame

[martin rudalics]

> Iʼll just say I donʼt see this with Gnome on Debian testing, with
> either emacs-27 or master, so once again itʼs window manager
> dependent.

What does (frame-height) give for your frame?

> Iʼm surprised that querying another font backend when we've already
> found a font causes frame sizing issues like this. Do we understand
> the cause here?

No.  All I can say is that it is tool bar related.

> We can revert the bug#43177 fix of course, but perhaps we should make
> it conditional on !GTK3 || PGTK or something?

First I'd like to fix the behavior for Emacs 27, conceptually at least.
Then we can discuss Bug#43177.

martin