Show internal ID under Identifier label

lutris/gui/config/game_common.py

@@ -190,11 +190,12 @@ def _get_sortname_box(self):
         return box
 
     def _get_slug_box(self):
-        identifier_box = Gtk.VBox(spacing=12, margin_right=12, margin_left=12)
+        slug_box = Gtk.VBox(spacing=12, margin_right=12, margin_left=12)
 
         slug_entry_box = Gtk.Box(spacing=12, margin_right=0, margin_left=0)
-
-        slug_entry_box.pack_start(Label(_("Identifier")), False, False, 0)
+        slug_label = Label()
+        slug_label.set_markup(_("Identifier\n<span size='x-small'>(Internal ID: %s)</span>") % self.game.id)
+        slug_entry_box.pack_start(slug_label, False, False, 0)
 
         self.slug_entry = SlugEntry()
         self.slug_entry.set_text(self.game.slug)
@@ -206,17 +207,9 @@ def _get_slug_box(self):
         self.slug_change_button.connect("clicked", self.on_slug_change_clicked)
         slug_entry_box.pack_start(self.slug_change_button, False, False, 0)
 
-        identifier_box.pack_start(slug_entry_box, True, True, 0)
-
-        game_id_box = Gtk.Box(spacing=12, margin_right=0, margin_left=12)
-        label = Label(_("Internal ID"))
-        game_id_box.pack_start(label, False, False, 0)
-        game_id_label = Label(_(str(self.game.id)))
-        game_id_box.pack_start(game_id_label, True, True, 0)
-
-        identifier_box.pack_start(game_id_box, True, True, 0)
+        slug_box.pack_start(slug_entry_box, True, True, 0)
 
-        return identifier_box
+        return slug_box
 
     def _get_directory_box(self):
         """Return widget displaying the location of the game and allowing to move it"""