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TextField labelText doesn't use floatingLabelStyle when unfocused #147231

@theodelrieu

Description

@theodelrieu

Steps to reproduce

Hello,

I've been trying to force my TextField to always use a floating label, by setting InputDecoration's floatingLabelBehavior to FloatingLabelBehavior.always.

However, when the field is not focused, or is empty, labelStyle is used.
By digging through the code, I found this line in InputDecorator.

Looking at the definition of _labelShouldWithdraw explains why I get this behavior. I then tried to set the same style for both labelStyle and floatingLabelStyle, but there is a very small animation when I focus/unfocus the text field.

By using FloatingLabelBehavior.always, I expected the label to stick to its position no matter in which state the TextField was.
Have I missed something?

Expected results

The label always stays in place, only applying floatingLabelStyle.

Actual results

The label alternates between floatingLabelStyle and labelStyle, even though FloatingLabelBehavior.always is used.

Code sample

Code sample
  TextField(
        decoration: InputDecoration(
          floatingLabelBehavior: FloatingLabelBehavior.always,
          labelText: "label",
          floatingLabelStyle: Theme.of(context).textTheme.labelLarge!,
         )
)

Screenshots or Video

Screenshots / Video demonstration
Screen.Recording.2024-04-23.at.13.53.40.mov

Logs

Logs
[Paste your logs here]

Flutter Doctor output

Doctor output
[✓] Flutter (Channel stable, 3.19.6, on macOS 14.2.1 23C71 darwin-arm64, locale en-FR)
    • Flutter version 3.19.6 on channel stable at /Users/theo/.local/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 54e66469a9 (6 days ago), 2024-04-17 13:08:03 -0700
    • Engine revision c4cd48e186
    • Dart version 3.3.4
    • DevTools version 2.31.1

[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/theo/Library/Android/sdk
    • Platform android-34, build-tools 33.0.0
    • ANDROID_HOME = /Users/theo/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
    ! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.13.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.2)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)

[✓] Connected device (3 available)
    • iPhone 15 (mobile) • BCE05AEF-41E7-48DF-BE31-969DE94790C4 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-17-0 (simulator)
    • macOS (desktop)    • macos                                • darwin-arm64   • macOS 14.2.1 23C71 darwin-arm64
    • Chrome (web)       • chrome                               • web-javascript • Google Chrome 124.0.6367.62

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

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a: text inputEntering text in a text field or keyboard related problemsf: material designflutter/packages/flutter/material repository.found in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer versionteam-designOwned by Design Languages teamworkaround availableThere is a workaround available to overcome the issue

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