bug#38402: [PATCH] Fix empty/incorrect GTK menus on HiDPI monitors with window scaling factor > 1

[Tobias Bading]

This should fix Bug#31223, Bug#28106, Bug#23672 as well as Ubuntu bug
https://bugs.launchpad.net/ubuntu/+source/emacs25/+bug/1695228

Also fixes the formerly unscaled Y value returned by
frame-monitor-workarea (and display-monitor-attributes-list).

For details on why some GTK menus were empty please see thread
https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg01061.html

* src/gtkutil.c
  (menubar_map_cb): properly scale req.height so that the menu bar's
  height is in device pixels as expected
  (xg_update_frame_menubar): dito
  (xg_event_is_for_menubar): properly scale rec.x and rec.y so that
  gtk_widget_intersect() works as intended
* src/xfns.c
  (Fx_display_monitor_attributes_list): properly scale work.x and work.y

0001-Fix-empty-incorrect-GTK-menus-on-HiDPI-monitors.patch
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