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Log the call stacks that mark widgets as needing to be rebuilt.
This is called whenever BuildOwner.scheduleBuildFor adds an element to the
dirty list. Typically this is as a result of Element.markNeedsBuild being
called, which itself is usually a result of State.setState being called.
To see when a widget is rebuilt, see debugPrintRebuildDirtyWidgets.
To see when the dirty list is flushed, see debugPrintBuildDirtyElements.