- Add x and y to the parent data, in case it's useful. In point of fact,
I ended up not needing it.
- Make columnWidths settable rather than having a setter so that the
code in the widgets layer is more idiomatic.
- Teach setFlatChildren about avoiding unnecessary drop/adopt loops.
- Assert that the child list length is correct more aggressively so that
we catch the dumb bug I had more quickly next time.
- Improve the toString() to handle empty tables better.
- Resort the imports in framework.dart.
- Introduce a LocalKey for cases where you don't want to allow use of
GlobalKey.
- Make inflateWidget and deactivateChild public for subclass use.
- Table widget.
- Cell widget.
- TableRow fake widget.
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