default screen property

Author: willmcgugan

src/textual/app.py

@@ -837,7 +837,7 @@ def __init_subclass__(cls, *args, **kwargs) -> None:
         return super().__init_subclass__(*args, **kwargs)
 
     def _get_dom_base(self) -> DOMNode:
-        return self.screen if self._compose_screen is None else self._compose_screen
+        return self.default_screen
 
     def validate_title(self, title: Any) -> str:
         """Make sure the title is set to a string."""
@@ -847,6 +847,11 @@ def validate_sub_title(self, sub_title: Any) -> str:
         """Make sure the subtitle is set to a string."""
         return str(sub_title)
 
+    @property
+    def default_screen(self) -> Screen:
+        """The default screen instance."""
+        return self.screen if self._compose_screen is None else self._compose_screen
+
     @property
     def workers(self) -> WorkerManager:
         """The [worker](/guide/workers/) manager.