Deprecate `InputDecoration.maintainHintHeight` in favor of `InputDecoration.maintainHintSize`

The InputDecoration.maintainHintHeight parameter was deprecated in favor of the InputDecoration.maintainHintSize parameter.

The defaults intrincic size of an input decorator depends on the hint size. The InputDecoration.maintainHintSize parameter can be set to false to make the intrincic size ignores the hint size when the hint is not visible. Previously, the InputDecoration.maintainHintHeight parameter was used to override the default intrinsic height and had no impact on the intrinsic width.

The InputDecoration.maintainHintHeight is deprecated in favor of InputDecoration.maintainHintSize which makes both the intrinsic width and height depend on the hint dimensions.

Replace InputDecoration.maintainHintHeight with InputDecoration.maintainHintSize to override the default intrisic size computation.

Code before migration:

TextField(
  indicator: InputDecoration(
    maintainHintHeight: false,
  ),
),

Code after migration:

TextField(
  indicator: InputDecoration(
    maintainHintSize: false,
  ),
),

Landed in version: 3.30.0-0.0.pre
In stable release: Not yet

API documentation:

• InputDecoration.maintainHintHeight
• InputDecoration.maintainHintSize

Relevant issues:

• Issue #93337

Relevant PRs:

• Fix TextField intrinsic width when hint is not visible

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