Fix for refresh bug

Author: willmcgugan

src/textual/app.py

@@ -2687,6 +2687,7 @@ def push_screen(
 
         if self._screen_stack:
             self.screen.post_message(events.ScreenSuspend())
+            self.screen.refresh()
         next_screen, await_mount = self._get_screen(screen)
         try:
             message_pump = active_message_pump.get()

src/textual/screen.py

@@ -1306,7 +1306,7 @@ def _get_inline_height(self, size: Size) -> int:
         inline_height = min(self.app.size.height, inline_height)
         return inline_height
 
-    def _screen_resized(self, size: Size):
+    def _screen_resized(self, size: Size) -> None:
         """Called by App when the screen is resized."""
         if self.stack_updates:
             self._refresh_layout(size)