[Wayland-bugs] [Bug 792889] On kwin_wayland, non-CSD GTK3 applications started with GDK_BACKEND=wayland *always* request CSD when they shouldn't

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792889

Fabian Vogt <fvogt at suse.com> changed:

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                 CC|                            |fvogt at suse.com

--- Comment #28 from Fabian Vogt <fvogt at suse.com> ---
(In reply to Drew DeVault from comment #25)
> Sorry, what do you expect from me? So far as I can tell Sway and GTK+ are
> both behaving as expected.

GTK currently violates the decoration management protocol, which leads to the
WM assuming that it uses CSD, but GTK assuming that it has SSD -> no decoration
at all.

The protocol says:

            If the client does not create a server-side decoration object for
            a surface the server interprets this as lack of support for this
            protocol and considers it as client-side decorated. Nevertheless a
            client-side decorated surface should use this protocol to indicate
            to the server that it does not want a server-side deco.

Which means that calling default_mode and getting SSD back is not enough, it
needs to be followed by a request_mode(SSD) call.

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