cinnamon-settings.py: Handle SIGINT so unmap/destroy handlers in

cs_applets and cs_panels can unhighlight any panels if terminated
this way.

Author: mtwebster

files/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py

@@ -20,7 +20,7 @@
 import gi
 gi.require_version('Gtk', '3.0')
 gi.require_version('XApp', '1.0')
-from gi.repository import Gio, Gtk, Pango, Gdk, XApp
+from gi.repository import Gio, GLib, Gtk, Pango, Gdk, XApp
 
 CURRENT_PATH = os.path.dirname(os.path.abspath(__file__))
 PYTHON_CS_MODULE_PATH = os.path.join(CURRENT_PATH, "modules")
@@ -301,6 +301,7 @@ def __init__(self, parsed_args):
         self.search_entry.connect("icon-press", self.onClearSearchBox)
 
         self.window.connect("destroy", self._quit)
+        GLib.unix_signal_add(GLib.PRIORITY_DEFAULT, signal.SIGTERM, self._quit)
 
         self.builder.connect_signals(self)
         self.sidePages: typing.List[SidePageData] = []