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

If window is not client side decorated then we should add shadow
also when using GTK+ theme.

https://bugzilla.gnome.org/show_bug.cgi?id=789251