Revamp the xlet settings:

- xlet settings now open in their own window/process
- matches new style of cinnamon settings
- now supports pages and sections in the settings file
- instances are now automatically highlighted in the panel when the instance is selected in the settings window (uses a new 'highlight' pseudoclass)
- uses the new JSON backend for easier maintenance and simplification of the code
- added support for backendable widgets which were not previously available to the xlet settings api
- updated for newer Gtk versions
- added a new configure function to applets and desklets

xlet settings can now be called with the following commands:
xlet-settings <applet|desklet|extension> <uuid>
xlet-settings <applet|desklet|extension> <uuid> <instanceid>

data/theme/cinnamon.css

@@ -1427,6 +1427,9 @@ StScrollBar StButton#vhandle:hover {
 .applet-box:hover {
 	color: #fff;
 }
+.applet-box:highlight {
+    background-color: #aa5555;
+}
 .applet-label {	
 	font-weight: bold;
 	color: #ccc;		
@@ -1451,6 +1454,10 @@ StScrollBar StButton#vhandle:hover {
     color: #fff;    
 }
 
+.desklet:highlight, .desklet:highlight-with-borders, .desklet:highlight-with-borders-and-header {
+    background-color: #aa5555;
+}
+
 .desklet-with-borders {
     border: 2px solid #a5a5a5;
     background-color: rgba(80, 80, 80, 0.8);

files/usr/bin/cinnamon-settings

@@ -4,6 +4,8 @@ import os, sys
 
 if len(sys.argv) > 1:
 	module = sys.argv[1]
+	if module in ("applets", "desklets", "extensions") and len(sys.argv) > 2 and sys.argv[2][0:5] != "panel":
+		os.execvp("/usr/share/cinnamon/cinnamon-settings/xlet-settings.py", ("", module[0:-1]) + tuple(sys.argv[2:]))
 	if os.path.exists("/usr/share/cinnamon/cinnamon-settings/modules/cs_%s.py" % module):
 		os.execvp("/usr/share/cinnamon/cinnamon-settings/cinnamon-settings.py", ("",) + tuple(sys.argv[1:]))
 	elif os.path.exists("/usr/bin/cinnamon-control-center"):

files/usr/bin/xlet-settings

@@ -0,0 +1,8 @@
+#!/usr/bin/python3
+
+import os, sys
+
+if len(sys.argv) < 3:
+	print("usage:\n    xlet-settings <xlet_type> <uuid>\nor\n    xlet-settings <xlet_type> <uuid> <instance_id>")
+else:
+	os.execvp("/usr/share/cinnamon/cinnamon-settings/xlet-settings.py", ("",) + tuple(sys.argv[1:]))

files/usr/share/cinnamon/applets/window-list@cinnamon.org/applet.js

@@ -687,9 +687,7 @@ AppMenuButtonRightClickMenu.prototype = {
         let item;
         let length;
         item = new PopupMenu.PopupIconMenuItem(_("Configure the window list"), "system-run", St.IconType.SYMBOLIC);
-        item.connect('activate', Lang.bind(this, function() {
-            Util.spawnCommandLine("cinnamon-settings applets window-list@cinnamon.org " + this._launcher._applet.instance_id);
-        }));
+        item.connect('activate', Lang.bind(this._launcher._applet, this._launcher._applet.configureApplet));
         this.addMenuItem(item);
 
         this.addMenuItem(new PopupMenu.PopupSeparatorMenuItem());

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

@@ -14,7 +14,6 @@
 gi.require_version("Gtk", "3.0")
 from gi.repository import Gio, Gtk, GObject, Gdk, GdkPixbuf, Pango, GLib
 
-import XletSettings
 from SettingsWidgets import SidePage, SettingsStack
 from Spices import Spice_Harvester
 
@@ -53,6 +52,29 @@ def find_extension_subdir(directory):
     else:
         return os.path.join(directory, ".".join(largest))
 
+translations = {}
+
+def translate(uuid, string):
+    #check for a translation for this xlet
+    if uuid not in translations:
+        try:
+            translations[uuid] = gettext.translation(uuid, home + "/.local/share/locale").ugettext
+        except IOError:
+            try:
+                translations[uuid] = gettext.translation(uuid, "/usr/share/locale").ugettext
+            except IOError:
+                translations[uuid] = None
+
+    #do not translate whitespaces
+    if not string.strip():
+        return string
+
+    if translations[uuid]:
+        result = translations[uuid](string)
+        if result != string:
+            return result
+    return _(string)
+
 class SurfaceWrapper:
     def __init__(self, surface):
         self.surface = surface
@@ -1231,11 +1253,7 @@ def _configure_extension(self, widget = None):
         model, treeiter = self.treeview.get_selection().get_selected()
         if treeiter:
             uuid = model.get_value(treeiter, 0)
-            settingContainer = XletSettings.XletSetting(uuid, self, self.collection_type)
-            self.content_box.pack_start(settingContainer.content, True, True, 2)
-            self.stack.hide()
-            settingContainer.show()
-            self._on_signal(None, None, "hide_stack", ())
+            subprocess.Popen(["xlet-settings", self.collection_type, uuid])
 
     def _external_configure_launch(self, widget = None):
         model, treeiter = self.treeview.get_selection().get_selected()
@@ -1311,8 +1329,8 @@ def load_extensions_in(self, directory, stock_theme = False):
                     setting_type = 0
                     data = json.loads(json_data)
                     extension_uuid = data["uuid"]
-                    extension_name = XletSettings.translate(data["uuid"], data["name"])
-                    extension_description = XletSettings.translate(data["uuid"], data["description"])
+                    extension_name = translate(data["uuid"], data["name"])
+                    extension_description = translate(data["uuid"], data["description"])
                     try: extension_max_instances = int(data["max-instances"])
                     except KeyError: extension_max_instances = 1
                     except ValueError: