Fix mirrors when single widget list passed to multiple bars

libqtile/bar.py

@@ -195,7 +195,10 @@ def __init__(self, widgets: list[_Widget], size: int, **config: Any) -> None:
         Gap.__init__(self, size)
         configurable.Configurable.__init__(self, **config)
         self.add_defaults(Bar.defaults)
-        self.widgets = widgets
+        # We need to create a new widget list here as users may have the same list for multiple
+        # screens. In that scenario, if we replace the widget with a mirror, it replaces it in every
+        # bar as python is referring to the same list.
+        self.widgets = widgets.copy()
         self.window: Internal | None = None
         self._configured = False
         self._draw_queued = False