widgets: clean up pending timeouts on destruction

src/controlCenter/widgets/quickSettings/tiles/bluetoothTile.vala

@@ -5,6 +5,12 @@ namespace XimperShellNotificationCenter.Widgets {
         private static string ?settings_cmd = null;
         private static bool settings_cmd_checked = false;
 
+        ~BluetoothTile () {
+            if (sync_timeout != 0) {
+                Source.remove (sync_timeout);
+            }
+        }
+
         public BluetoothTile (Json.Object ?cfg) {
             base ("bluetooth-active-symbolic",
                   _("Bluetooth"));

src/controlCenter/widgets/quickSettings/tiles/vpnTile.vala

@@ -16,6 +16,12 @@ namespace XimperShellNotificationCenter.Widgets {
         private bool updating_submenu = false;
         private bool connecting = false;
 
+        ~VpnTile () {
+            if (sync_timeout != 0) {
+                Source.remove (sync_timeout);
+            }
+        }
+
         public VpnTile (Json.Object ?cfg) {
             base ("network-vpn-symbolic", _("VPN"));
             setup_arrow ();

src/controlCenter/widgets/quickSettings/tiles/wifiTile.vala

@@ -22,6 +22,12 @@ namespace XimperShellNotificationCenter.Widgets {
         private bool connecting = false;
         private bool updating_submenu = false;
 
+        ~WifiTile () {
+            if (sync_timeout != 0) {
+                Source.remove (sync_timeout);
+            }
+        }
+
         public WifiTile (Json.Object ?cfg) {
             base ("network-wireless-offline-symbolic",
                   _("Wi-Fi"));

src/controlCenter/widgets/volume/volume.vala

@@ -33,6 +33,12 @@ namespace XimperShellNotificationCenter.Widgets {
                 default_device_changed);
         }
 
+        ~Volume () {
+            if (sink_rebuild_timeout != 0) {
+                Source.remove (sink_rebuild_timeout);
+            }
+        }
+
         public Volume (string suffix) {
             base (suffix);