[gnome-tweak-tool] Add tweak for mouse-button-modifier on Windows group

[John Stowers <jstowers src gnome org>]

commit 0d3840c06fb823bff41b49a295a17f0ad8b729c9
Author: Rui Matos <tiagomatos gmail com>
Date:   Sat Oct 6 19:02:26 2012 +0200

    Add tweak for mouse-button-modifier on Windows group
    
    https://bugzilla.gnome.org/show_bug.cgi?id=678648

 gtweak/tweaks/tweak_windows.py |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_windows.py b/gtweak/tweaks/tweak_windows.py
index 12f6fbf..399a6ee 100644
--- a/gtweak/tweaks/tweak_windows.py
+++ b/gtweak/tweaks/tweak_windows.py
@@ -43,4 +43,8 @@ TWEAKS = (
     GSettingsComboEnumTweak("org.gnome.desktop.wm.preferences", "action-middle-click-titlebar", group_name=TWEAK_GROUP_WINDOWS),
     GSettingsComboEnumTweak("org.gnome.desktop.wm.preferences", "action-right-click-titlebar", group_name=TWEAK_GROUP_WINDOWS),
     GSettingsComboEnumTweak("org.gnome.desktop.wm.preferences", "focus-mode", group_name=TWEAK_GROUP_WINDOWS),
+    GSettingsComboTweak("org.gnome.desktop.wm.preferences",
+                        "mouse-button-modifier",
+                        [("disabled", _("Disabled")), ("<Alt>", "Alt"), ("<Super>", "Super")],
+                        group_name=TWEAK_GROUP_WINDOWS),
 )