fix dismiss

src/textual/command.py

@@ -1232,7 +1232,7 @@ def _select_or_command(
                 self._cancel_gather_commands()
                 self.app.post_message(CommandPalette.Closed(option_selected=True))
                 self.dismiss()
-                self.call_later(self._selected_command.command)
+                self.app.call_later(self._selected_command.command)
 
     @on(OptionList.OptionHighlighted)
     def _stop_event_leak(self, event: OptionList.OptionHighlighted) -> None:

tests/snapshot_tests/test_snapshots.py

@@ -2950,7 +2950,12 @@ def on_mount(self) -> None:
         def on_resize(self) -> None:
             self.add_class("narrow")
 
-    assert snap_compare(SCApp())
+    async def run_before(pilot: Pilot):
+        await pilot.pause()
+        await pilot.wait_for_animation()
+        await pilot.pause()
+
+    assert snap_compare(SCApp(), run_before=run_before)
 
 
 def test_add_remove_tabs(snap_compare):

tests/test_command.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from typing import Iterable
+
+from textual.app import App, ComposeResult, SystemCommand
+from textual.containers import Grid
+from textual.screen import ModalScreen, Screen
+from textual.widgets import Button, Label
+
+
+class QuitScreen(ModalScreen[bool]):
+    """Screen with a dialog to quit."""
+
+    def compose(self) -> ComposeResult:
+        yield Grid(
+            Label("Are you sure you want to quit?", id="question"),
+            Button("Quit", variant="error", id="quit"),
+            Button("Cancel", variant="primary", id="cancel"),
+            id="dialog",
+        )
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        if event.button.id == "quit":
+            self.dismiss(True)
+        else:
+            self.dismiss(False)
+
+
+class ModalApp(App):
+    """An app with a modal dialog."""
+
+    BINDINGS = [("q", "request_quit", "Quit")]
+
+    def __init__(self) -> None:
+        self.check_quit_called = False
+        super().__init__()
+
+    def get_system_commands(self, screen: Screen) -> Iterable[SystemCommand]:
+        yield from super().get_system_commands(screen)
+        yield SystemCommand(
+            "try a modal quit dialog", "this should work", self.action_request_quit
+        )
+
+    def action_request_quit(self) -> None:
+        """Action to display the quit dialog."""
+
+        def check_quit(quit: bool | None) -> None:
+            """Called when QuitScreen is dismissed."""
+            self.check_quit_called = True
+
+        self.push_screen(QuitScreen(), check_quit)
+
+
+async def test_command_dismiss():
+    """Regression test for https://github.com/Textualize/textual/issues/5512"""
+    app = ModalApp()
+
+    async with app.run_test() as pilot:
+        await pilot.press("ctrl+p", *"modal quit", "enter")
+        await pilot.pause()
+        await pilot.press("enter")
+        await pilot.pause()
+        assert app.check_quit_called