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Closes #15400

When using a TextFormField with a validator function, users were sometimes surprised to see that the TextFormField would grow when an error appeared.

Input without error
flutter_01

This PR updates the documentation to include useful fixes to this problem.

@justinmc justinmc self-assigned this Mar 22, 2019
@justinmc justinmc requested a review from HansMuller March 22, 2019 20:28
@goderbauer goderbauer added the framework flutter/packages/flutter repository. See also f: labels. label Mar 25, 2019
@HansMuller HansMuller added the f: material design flutter/packages/flutter/material repository. label Mar 26, 2019
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LGTM

@justinmc justinmc merged commit ed95096 into flutter:master Mar 27, 2019
@justinmc justinmc deleted the text-validator-height branch March 27, 2019 16:52
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TextField height changes if the errorText shows

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