Add regression test for #2229.

tests/snapshot_tests/snapshot_apps/quickly_change_tabs.py

@@ -0,0 +1,29 @@
+"""Regression test for https://github.com/Textualize/textual/issues/2229."""
+from textual.app import App, ComposeResult
+from textual.widgets import TabbedContent, TabPane, Tabs, DirectoryTree
+
+
+class QuicklyChangeTabsApp(App[None]):
+    CSS = """
+    DirectoryTree {
+        min-height: 10;
+    }"""
+
+    def compose(self) -> ComposeResult:
+        with TabbedContent():
+            with TabPane("one"):
+                yield DirectoryTree("./")
+            with TabPane("two"):
+                yield DirectoryTree("./")
+            with TabPane("three", id="three"):
+                yield DirectoryTree("./")
+
+    def key_p(self) -> None:
+        self.query_one(Tabs).action_next_tab()
+        self.query_one(Tabs).action_next_tab()
+
+
+app = QuicklyChangeTabsApp()
+
+if __name__ == "__main__":
+    app.run()

tests/snapshot_tests/test_snapshots.py

@@ -429,3 +429,8 @@ def test_scroll_to_center(snap_compare):
     # scrolled so that the red string >>bullseye<< is centered on the screen.
     # When this snapshot "breaks" because #2254 is fixed, this snapshot can be updated.
     assert snap_compare(SNAPSHOT_APPS_DIR / "scroll_to_center.py", press=["s"])
+
+
+def test_quickly_change_tabs(snap_compare):
+    # https://github.com/Textualize/textual/issues/2229
+    assert snap_compare(SNAPSHOT_APPS_DIR / "quickly_change_tabs.py", press=["p"])