1f15e06e45
Previously, if a StatefulWidget was marked dirty, then removed from the build, then reinserted using the exact same widget under a widget under a LayoutBuilder, it wouldn't rebuild. This fixes that. It also introduces an assert that's supposed to catch SizeObserver-like behaviour. Rather than make this patch even bigger, I papered over two pre-existing bugs which this assert uncovered (and fixed the other problems it found): https://github.com/flutter/flutter/issues/5751 https://github.com/flutter/flutter/issues/5749 We should fix those before 1.0 though.
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