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Do not crash on exit due to dangling layer pointer (fixes #18732)
When using attribute dialog to edit attributes of multiple selected features, the dialog may stay alive until QGIS exits (parented to QgisApp) and its internal QgsActionMenu would try to reload actions when they get removed in ~QgisApp, referring to a deleted map layer, so let's clean things up when the layer gets deleted to avoid trouble later.
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