[gnome-tweaks] general: Don't show Over-Amplification in Ubuntu session

[Jeremy Bicha <jbicha src gnome org>]

commit 3367aaddc26cb95907f9263dcb1a022e7aeeb2c4
Author: Jeremy Bicha <jbicha ubuntu com>
Date:   Fri Aug 17 16:50:52 2018 -0400

    general: Don't show Over-Amplification in Ubuntu session
    
    In the Ubuntu session, the Over-Amplification setting is
    in the GNOME Settings app. But in the "vanilla" GNOME session —
    even on Ubuntu — there is no Over-Amplification setting there.
    
    Closes: https://gitlab.gnome.org/GNOME/gnome-tweaks/issues/127

 gtweak/tweaks/tweak_group_general.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/gtweak/tweaks/tweak_group_general.py b/gtweak/tweaks/tweak_group_general.py
index 0e0130b..2124691 100644
--- a/gtweak/tweaks/tweak_group_general.py
+++ b/gtweak/tweaks/tweak_group_general.py
@@ -5,10 +5,13 @@
 from gi.repository import Gio, GLib, Gtk
 
 import gtweak
+from gtweak.gshellwrapper import GnomeShellFactory
 from gtweak.tweakmodel import Tweak
 from gtweak.widgets import ListBoxTweakGroup, GetterSetterSwitchTweak, GSettingsSwitchTweak
 from gtweak.utils import AutostartFile
 
+_shell = GnomeShellFactory().get_shell()
+_shell_not_ubuntu = _shell.mode != 'ubuntu'
 
 class IgnoreLidSwitchTweak(GetterSetterSwitchTweak):
     def __init__(self, **options):
@@ -42,11 +45,13 @@ class IgnoreLidSwitchTweak(GetterSetterSwitchTweak):
                      None, 0, -1, None)
             return False
 
+
 TWEAK_GROUPS = [
     ListBoxTweakGroup(_("General"),
         GSettingsSwitchTweak(_("Animations"), "org.gnome.desktop.interface", "enable-animations"),
         IgnoreLidSwitchTweak(),
+        # Don't show this setting in the Ubuntu session since this setting is in gnome-control-center there
         GSettingsSwitchTweak(_("Over-Amplification"), "org.gnome.desktop.sound", 
"allow-volume-above-100-percent",
-            desc=_("Allows raising the volume above 100%. This can result in a loss of audio quality; it is 
better to increase application volume settings, if possible.")),
+            desc=_("Allows raising the volume above 100%. This can result in a loss of audio quality; it is 
better to increase application volume settings, if possible."), loaded=_shell_not_ubuntu),
     ),
 ]