Working on extracting the prefs UI code from the App class

tclCommands/TclCommandSaveSys.py

@@ -50,4 +50,4 @@ class TclCommandSaveSys(TclCommandSignaled):
         :return: None or exception
         """
 
-        self.app.save_defaults(args)
+        self.app.preferencesUiManager.save_defaults(args)

tclCommands/TclCommandSetSys.py

@@ -83,8 +83,7 @@ class TclCommandSetSys(TclCommand):
                 pass
 
             self.app.defaults[param] = value
-
-            self.app.propagate_defaults(silent=True)
+            self.app.defaults.propagate_defaults()
 
         else:
             self.raise_tcl_error("No such system parameter \"{}\".".format(param))