- truncate pixel values to 1dp since there's really no point being told
the Size is 302.98732587287 by 648.28498579187.
- describe more Widgets so that debugDumpApp() is more useful.
- remove bufferValue from ProgressIndicator (cc @hansmuller) since it's
not yet implemented.
- half-hearted toString() for ThemeData. There's no point making a
complete one, since it would cause line-wrap even on big monitors in
debugDumpApp dumps, and you can easily get the actual values from a
debugging if that's the issue.
- flesh out BoxConstraints.toString() so that fully unconstrained and
fully infinite constraints are called out explicitly. I experimented
with adding even more special cases, e.g. calling out unconstrained
widths with fixed heights, etc, but it made the output less readable.
- remove a redundant _updateVariable() in AnimatedContainer (cc
@abarth).
- add more information to RenderView.toString().
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