Background refresh

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased
+
+### Fixed
+
+- Fixed background refresh https://github.com/Textualize/textual/issues/3055
+
+
 ## [0.32.0] - 2023-08-03
 
 ### Added

src/textual/app.py

@@ -2333,7 +2333,7 @@ def _display(self, screen: Screen, renderable: RenderableType | None) -> None:
         """
 
         try:
-            if screen is not self.screen or renderable is None:
+            if renderable is None:
                 return
 
             if (
@@ -2342,6 +2342,9 @@ def _display(self, screen: Screen, renderable: RenderableType | None) -> None:
                 and not self.is_headless
                 and self._driver is not None
             ):
+                if screen is not self.screen:
+                    self.screen.refresh()
+                    return
                 console = self.console
                 self._begin_update()
                 try:

src/textual/screen.py

@@ -183,7 +183,7 @@ def is_current(self) -> bool:
         from .app import ScreenStackError
 
         try:
-            return self.app.screen is self
+            return self.app.screen is self or self in self.app._background_screens
         except ScreenStackError:
             return False