[Wayland-bugs] [Bug 759161] New: wayland: dialog stacking without parents (RFC)

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759161

            Bug ID: 759161
           Summary: wayland: dialog stacking without parents (RFC)
    Classification: Platform
           Product: gtk+
           Version: 3.19.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: ofourdan at redhat.com
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 316915
  --> https://bugzilla.gnome.org/attachment.cgi?id=316915&action=edit
Attaching simple program to demonstrate the issue

Description:

Some applications use the type hint "dialog" without specifying a transient.

On X11, most fine window managers like mutter will treat the dialog window as a
"transient for the group" and keep the dialog above the other windows of the
same group.

On Wayland, xdg-shell features the set_parent() [1] method to specify that a
dialog is related to a parent window, but unfortunately there is no such thing
as "transient for group" in Wayland.

On wayland-devel mailing list [2], I was told that "the client must have
absolute final control, with no ambiguity, over the stacking order and
visibility of every surface" (unfortunately th reply does not show in the ML
archives so I cannot link it...).

So that means if we want to replicate the behaviour with dialogs without
transient (parent) in Wayland, we have to manage the stacking in the
applications, thus gtk+.

I reckon that would add some complexity to gtk+/gdk and its Wayland back-end.

So. is this something we want for gtk+?

Steps to reproduce:

1. Save and build the attach program
2. Run it on X11 and on Wayland

Actual result:

On X11, the dialog type window is kept above the two other windows.
On Wayland, all windows and can be raised independently.

Expected result:

Consistent stacking between Wayland and X11.

Additional info:

[1]
http://cgit.freedesktop.org/wayland/wayland-protocols/tree/unstable/xdg-shell/xdg-shell-unstable-v5.xml#n171
[2]
http://lists.freedesktop.org/archives/wayland-devel/2015-November/025726.html

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