cc08940e62
The underlying _updateNode call requires that all parameters be set non-null. There's a single call site in the framework in lib/src/semantics/semantics.dart in SemanticsNode.updateWith(). At that call site, all parameters are either asserted non-null in the constructor of SemanticsData or defaulted to null, with the sole exception of textDirection. The ergonomics of this method are currently pretty ugly and we should consider migrating most of the defaulting and assertions that we apply at the call site up to the definition in dart:ui. That work is filed as https://github.com/flutter/flutter/issues/57720.
Flutter Engine
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