Adam Barth 20015400f9 TextField centering should work in loose constraints (#9153)
We should always use the maxWidth from the incomming constraints to size the
text inside the editable because the EditableText itself always expands to fill
its width.

Also, make sure InputDecoration always expands horizontially (even when there's
no icon) for consistency.

Fixes #9149
2017-04-03 20:48:54 -07:00
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