Adding upstream version 4.0.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/snapshots/test_prevent_default.py

@@ -0,0 +1,49 @@
+"""Let's ensure the `prevent_default_tab` and `prevent_default_enter` options work as expected."""
+
+from __future__ import annotations
+
+from typing import Any
+from textual.app import App, ComposeResult
+from textual.widgets import Button, Input
+from textual_autocomplete import AutoComplete
+
+
+class PreventDefaultTab(App[None]):
+    """Test that the default tab key is permitted if `prevent_default_tab` is `False`."""
+
+    def __init__(
+        self, prevent_default_tab: bool = False, *args: Any, **kwargs: Any
+    ) -> None:
+        super().__init__(*args, **kwargs)
+        self.prevent_default_tab = prevent_default_tab
+
+    def compose(self) -> ComposeResult:
+        input = Input(placeholder="Type something...")
+        input.cursor_blink = False
+        yield input
+        yield AutoComplete(
+            input,
+            candidates=["foo", "bar"],
+            prevent_default_tab=self.prevent_default_tab,
+        )
+        yield Button("I'm here to test focus.")
+
+
+async def test_switch_focus_on_completion_via_tab_key__prevent_default_tab_is_false():
+    """The default tab key should not be prevented if `prevent_default_tab` is `False`."""
+    app = PreventDefaultTab(prevent_default_tab=False)
+    async with app.run_test() as pilot:
+        await pilot.press("f", "tab")
+        assert app.query_one(Input).value == "foo"
+        assert app.query_one(Button).has_focus
+
+
+async def test_no_focus_switch_via_tab_key__prevent_default_tab_is_true():
+    """`prevent_default_tab` is `True`, so focus should switch on completion with tab."""
+    app = PreventDefaultTab(prevent_default_tab=True)
+    async with app.run_test() as pilot:
+        await pilot.press("f", "tab")
+        input_widget = app.query_one(Input)
+        assert input_widget.value == "foo"
+        assert input_widget.has_focus
+        assert not app.query_one(Button).has_focus