Save username and password after successful auth

source/ShowScenes.brs

@@ -111,11 +111,18 @@ function CreateSigninGroup(user = "")
   username_field.label = tr("Username")
   username_field.field = "username"
   username_field.type = "string"
-  username_field.value = user
+  if user = "" and get_setting("username") <> invalid
+    username_field.value = get_setting("username")
+  else
+    username_field.value = user
+  end if
   password_field = CreateObject("roSGNode", "ConfigData")
   password_field.label = tr("Password")
   password_field.field = "password"
   password_field.type = "password"
+  if get_setting("password") <> invalid
+    password_field.value = get_setting("password")
+  end if
   items = [ username_field, password_field ]
   config.configItems = items
 
@@ -143,7 +150,11 @@ function CreateSigninGroup(user = "")
       if node = "submit"
         ' Validate credentials
         get_token(username.value, password.value)
-        if get_setting("active_user") <> invalid then return "true"
+        if get_setting("active_user") <> invalid
+          set_setting("username", username.value)
+          set_setting("password", password.value)
+          return "true"
+        end if
         print "Login attempt failed..."
         group.findNode("alert").text = tr("Login attempt failed.")
       end if