[Wayland-bugs] [Bug 782117] New: If a window was initially shown undecorated and set_decorated(True) is called, titlebar is drawn inside the window

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782117

            Bug ID: 782117
           Summary: If a window was initially shown undecorated and
                    set_decorated(True) is called, titlebar is drawn
                    inside the window
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: gnome at genodeftest.de
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 350963
  --> https://bugzilla.gnome.org/attachment.cgi?id=350963&action=edit
A demo python3 script

Steps to reproduce:
0. on a GNOME/Wayland session,
1. create a window with decorations
2. show the window
3. unset the decorations using gtk_window_set_decorated(window, false)

What happens:
The window messes up, drawing the titlebar way inside the window.

What should happen:
Do not draw the titlebar inside the window.

Affected version:
gtk3-3.22.12-2.fc25.x86_64

Additional info:
This issue is not present on x11 with GDK_BACKEND=x11 enforced on a
GNOME/Wayland session.

I know that the documentation specifies that unsetting the decoration may fail,
but since Gtk+ on Wayland uses client-side decorations, there is no window
manager to blame.

To reproduce, simply run the attached python script with
> python3 test_window_decoration_on_wayland.py

inside a GNOME/wayland session. If you run it with
> GDK_BACKEND=x11 python3 test_window_decoration_on_wayland.py

instead, it will work fine.

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