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Docs explaining how to avoid the problem of height toggling with error (#29811)

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Documentation that explains a common use case seen in Github issues where users were surprised by TextFormField growth to accommodate validation messages.
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Justin McCandless 2019-03-27 09:52:23 -07:00 committed by GitHub
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packages/flutter/lib/src/widgets/form.dart
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@ -288,6 +288,13 @@ class FormField<T> extends StatefulWidget {
/// The returned value is exposed by the [FormFieldState.errorText] property.
/// The [TextFormField] uses this to override the [InputDecoration.errorText]
/// value.
///
/// Alternating between error and normal state can cause the height of the
/// [TextFormField] to change if no other subtext decoration is set on the
/// field. To create a field whose height is fixed regardless of whether or
/// not an error is displayed, either wrap the [TextFormField] in a fixed
/// height parent like [SizedBox], or set the [TextFormField.helperText]
/// parameter to a space.
final FormFieldValidator<T> validator;
/// Function that returns the widget representing this form field. It is