unhighlight rows on change

keymapper/gtk/row.py

@@ -111,6 +111,10 @@ class Row(Gtk.ListBoxRow):
         """Mark this row as changed."""
         self.get_style_context().add_class('changed')
 
+    def unhighlight(self):
+        """Mark this row as unchanged."""
+        self.get_style_context().remove_class('changed')
+
     def on_character_input_change(self, entry):
         keycode = self.get_keycode()
         character = self.get_character()

keymapper/gtk/window.py

@@ -170,6 +170,11 @@ class Window:
         key_list.forall(key_list.remove)
         custom_mapping.empty()
 
+    def unhighlight_all_rows(self):
+        """Remove all rows from the mappings table."""
+        key_list = self.get('key_list')
+        key_list.forall(lambda row: row.unhighlight())
+
     def on_apply_system_layout_clicked(self, button):
         """Load the mapping."""
         setxkbmap(self.selected_device, None)
@@ -315,3 +320,4 @@ class Window:
         )
 
         custom_mapping.changed = False
+        self.unhighlight_all_rows()