bug#28189: 26.0.50; Emacs uses deprecated function gtk_window_parse_geometry

[martin rudalics <rudalics@gmx.at>]

 > I've now pushed the remaining changes as well,

Thanks.  At least for the background color fix your decision to push to
master was probably right.  But we really should consider backporting
your changes to the release branch if after a few weeks no problems
arise.  From recent bug reports it's quite evident that most people
remained on master and the release branch is hardly tested at all.  So
I'm quite confident that your changes are already getting tested.

 > except for the popup menu
 > change. With that change, the menus seem to get positioned incorrectly
 > along the vertical axis, but I can't figure out how to fix it. I could push
 > the changes nevertheless and hope that somebody else might find a fix. WDYT?

Please post this patch separately and explicitly ask people to try it.
The GTK menu bug reports (25064, 26130, 26855, 27131, 27667, 28511) -
though most of them by the same author but yet all with GTK 3.22 -
abandon and really should get treatment before the release.  Virtually
any patch might give us some insight here.  So please send the patch to
the thread with most of the reports (25064, 26130, 26855, 27131) merged
in and let's see whether it at least eliminates some warnings.  Maybe
we're lucky.

And again many thanks for your efforts, martin