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Pascal Welsch authored
`WidgetsApp.debugShowWidgetInspectorOverride` was replaced with ` WidgetsBinding.instance.debugShowWidgetInspectorOverrideNotifier` in https://github.com/flutter/flutter/pull/144029. The old API was removed, not deprecated. It is used by some [open-source projects](https://github.com/search?q=WidgetsApp.debugShowWidgetInspectorOverride&type=code), thus I'm making the effort of bringing the API back as deprecated. Fixes https://github.com/flutter/flutter/issues/145333