Owen W. Taylor authored Dec 16, 2013 and Alberts Muktupāvels committed Sep 08, 2018

When a client spontaneously focuses their window, perhaps in response
to WM_TAKE_FOCUS we'll get a FocusOut/FocusIn pair with same serial.
Updating display->focus_serial in response to FocusOut then was causing
us to ignore FocusIn and think that the focus was not on any window.

We need to distinguish this spontaneous case from the case where we
set the focus ourselves - when we set the focus ourselves, we're careful
to combine the SetFocus with a property change so that we know definitively
what focus events we have already accounted for.

https://bugzilla.gnome.org/show_bug.cgi?id=720558

When we set the input focus, we first set the predicted window,
and then try to process focus events. But as FocusOut on the
existing window comes before FocusIn on the new window, we'll
see the focus out on the old window and think the focus is going
to nothing, which makes metacity think the prediction failed.

Fix this by making sure that we ignore focus window changes of our
own cause when updating the focus window field, by ignoring all
focus events that have a serial the same as the focus request or
lower. Note that if metacity doens't make any requests after the
focus request, this could be racy, as another client could steal
the focus, but metacity would ignore it as the serial was the same.
Bump the serial by making a dummy ChangeProperty request to a
metactiy-controlled window in this case.

Based on mutter commit:
https://gitlab.gnome.org/GNOME/mutter/commit/7fdfbad6d495ede1632588e528801443846e5f6d

And remove unused variables from MetaKeyHandler struct that was
introduced in 179549b7 commit.

GNOME Flashback will install GSettings override file to change
button-layout default value.

Follow mutter and rename xineramas to monitors.

Solaris should work with Xfree Xinerama according to these bugs:
- https://bugzilla.gnome.org/show_bug.cgi?id=674727
- https://bugzilla.gnome.org/show_bug.cgi?id=580079

warning: implicit conversion from ‘gfloat {aka float}’ to ‘double’
to match other operand of binary expression [-Wdouble-promotion]

warning: implicit conversion from ‘float’ to ‘double’ to match
other operand of binary expression [-Wdouble-promotion]

warning: implicit conversion from ‘float’ to ‘double’ to match
other operand of binary expression [-Wdouble-promotion]

Set the NET_WM_STATE_FOCUSED property on windows of type dock or
spashscreen so that they don't get the state GTK_STATE_FLAG_BACKDROP
set by default.

Based on xfwm4 commit:
https://git.xfce.org/xfce/xfwm4/commit/?id=0feb29e78bb3