bug#32975: Emacs 26.1; GTK Warnings

[martin rudalics]

> I can't reproduce this under Gnome or KDE, with the same GTK version.
> Which window manager/desktop environment is being used here?

I don't have that GTK version installed to test here.  But note this
question of the OP:

> The left side scroll bar?

By default, GTK builds show scroll bars on the right so either he has
customized them already (which makes me wonder why he asked how to
turn off scroll bars) or other strange things are going on.

martin