Fix AttributeError: use set_size_request instead of set_width_request

src/widgets/variable_data_row.py

@@ -65,7 +65,7 @@ class VariableDataRow(Gtk.Box):
         for env in self.environments:
             # Create a box to hold the entry (for size group alignment)
             entry_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
-            entry_box.set_width_request(200)
+            entry_box.set_size_request(200, -1)
 
             entry = Gtk.Entry()
             entry.set_placeholder_text(env.name)