[Wayland-bugs] [Bug 764519] Two finger tap on title bars non-functional on GTK3 apps and wayland

[mutter (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764519

Carlos Garnacho <carlosg at gnome.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |carlosg at gnome.org
          Component|Backend: Wayland            |wayland
           Assignee|gtk-bugs at gtk.org            |mutter-maint at gnome.bugs
            Product|gtk+                        |mutter
         QA Contact|gtk-bugs at gtk.org            |mutter-maint at gnome.bugs

--- Comment #2 from Carlos Garnacho <carlosg at gnome.org> ---
I can reproduce with touchpad. AFAICS this was originally introduced by the
patch in https://bugzilla.gnome.org/show_bug.cgi?id=731237#c11 .

What happens here is that libinput will transform the 2 finger tap in two
consecutive press+release events. Those are handled almost at once in
clutter/mutter, so when the client has the opportunity to request
xdg_surface.show_window_menu, the button count will again/already be 0, so the
request is ignored.

The check for buttons being pressed makes sense for drags/resizes, not as much
for this "show menu" case, probably should be taken out of
meta_wayland_pointer_can_grab_surface() checks and into the interested callers.

Moving to mutter.

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