Additional sleep after tabbing to guard vs races

Author: darrenburns

src/textual/app.py

@@ -632,6 +632,12 @@ async def press_keys() -> None:
                             print(f"press {key!r} (char={char!r})")
                             key_event = events.Key(self, key, char)
                             driver.send_event(key_event)
+                            # TODO: A bit of a fudge - extra sleep after tabbing to help guard against race
+                            #  condition between widget-level key handling and app/screen level handling.
+                            #  More information here: https://github.com/Textualize/textual/issues/1009
+                            #  This conditional sleep can be removed after that issue is closed.
+                            if key == "tab":
+                                await asyncio.sleep(0.05)
                             await asyncio.sleep(0.02)
 
                     await app._animator.wait_for_idle()

tests/snapshot_tests/test_snapshots.py

@@ -58,9 +58,9 @@ def test_checkboxes(snap_compare):
 def test_input_and_focus(snap_compare):
     press = [
         "tab",
-        *list("Darren"),  # Focus first input, write "Darren"
+        *"Darren",  # Focus first input, write "Darren"
         "tab",
-        *list("Burns"),  # Tab focus to second input, write "Burns"
+        *"Burns",  # Tab focus to second input, write "Burns"
     ]
     assert snap_compare("docs/examples/widgets/input.py", press=press)