Account for secondary screen not having history buffer

kitty/window.py

@@ -438,6 +438,7 @@ def destroy(self):
 
     def as_text(self, as_ansi=False, add_history=False, add_pager_history=False, add_wrap_markers=False, alternate_screen=False):
         lines = []
+        add_history = add_history and not (self.screen.is_using_alternate_linebuf() ^ alternate_screen)
         if alternate_screen:
             f = self.screen.as_text_alternate
         else: