[Wayland-bugs] [Bug 759738] wayland: use a subsurface for GDK_WINDOW_TEMP if attached to a toplevel

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759738

--- Comment #1 from Olivier Fourdan <ofourdan at redhat.com> ---
Created attachment 317735
  --> https://bugzilla.gnome.org/attachment.cgi?id=317735&action=edit
wayland: prefer subsurface when possible

Quite a few applications use GTK_WINDOW_POPUP to create various temporary
windows and place then on screen. That works fine on X11 but on Wayland there
is no global coordinate system for regular surfaces.

If the application is using a gdk temp window and set a parent with
gtk_window_transient_for(), the gdk wayland backend has all it needs to create
a subsurface that can be placed at will by the application.

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