Add a snapshot test for a rebuilt Select

This helps test the practical impact of the fix added for #2557.

tests/snapshot_tests/snapshot_apps/select_rebuild.py

@@ -0,0 +1,21 @@
+"""Test https://github.com/Textualize/textual/issues/2557"""
+
+from textual.app import App, ComposeResult
+from textual.widgets import Select, Button
+
+
+class SelectRebuildApp(App[None]):
+
+    def compose(self) -> ComposeResult:
+        yield Select[int]((("1", 1), ("2", 2)))
+        yield Button("Rebuild")
+
+    def on_button_pressed(self):
+        self.query_one(Select).set_options((
+            ("This", 0), ("Should", 1), ("Be", 2),
+            ("What", 3), ("Goes", 4), ("Into",5),
+            ("The", 6), ("Snapshit", 7)
+        ))
+
+if __name__ == "__main__":
+    SelectRebuildApp().run()