[Wayland-bugs] [Bug 780422] New: Focus events are not always matched

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780422

            Bug ID: 780422
           Summary: Focus events are not always matched
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: jonathon at quotidian.org
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

In virt-viewer, we are getting a warning in the terminal when running under
wayland. 

Some very short background: virt-viewer does certain things (e.g. grab the
keyboard, enable usb auto-redirect, etc) when the spice widget gets focus, and
"undoes" those things when the widget loses focus. 

The reason that we are getting a warning is because we are not getting matched
focus-in and focus-out events. When running under wayland in Fedora 25, if we
click inside the virt-viewer window, a focus-in event is generated. However,
when clicking outside of the window, *two* focus-out events are generated. The
handler for the first event runs without problem, but the second one generates
a warning since it is attempting to perform a task that has already been
performed by the first handler.

I bisected gtk+ to determine when the problem appeared, and came up with the
following commit:

commit de2268000d7e3eb5e84603810f9a6f971efb1072
Author: Carlos Garnacho <carlosg at gnome.org>
Date:   Wed Jun 24 17:48:18 2015 +0200

    wayland: Ensure device grabs generate crossing/focus events

    On X11 this is something the windowing system does for us, which the
    wayland backend should emulate, being grabs completely client-side.

    So, if the grab and current focus windows differ, make sure we emit
    focus/crossing events as it corresponds to the grab device.

I've not yet been able to create a minimal test case to trigger this bug in
gtk+.

This bug was initially opened in the spice bug tracker, but after discussing it
with some Gtk+ developers, they suggested opening a bug in Gtk+. Original bug
is here: https://bugs.freedesktop.org/show_bug.cgi?id=99296

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