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[master, v1.12.3-pre.49] PageView's last page no longer snaps when viewportFraction is set to less than 1 #45096

@januwA

Description

@januwA

Steps to Reproduce

PageController's viewportFraction property is set to less than 1, and there is a bounce when switching pages.

https://gist.github.com/januwA/8bfdbcfe3436231c48f437a3e72729e6

flutter-bug

λ flutter doctor -v
[√] Flutter (Channel master, v1.12.3-pre.49, on Microsoft Windows [Version 10.0.18362.476], locale zh-CN)
    • Flutter version 1.12.3-pre.49 at D:\my-tools\flutter
    • Framework revision 21e6fe1ddf (8 hours ago), 2019-11-17 23:39:51 -0500
    • Engine revision 3261324fab
    • Dart version 2.7.0

[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at D:\my-tools\Android\Sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = D:\my-tools\Android\Sdk
    • Java binary at: D:\my-tools\Android\AndroidStudio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup
      for detailed instructions.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.5)
    • Android Studio at D:\my-tools\Android\AndroidStudio
    • Flutter plugin version 41.0.2
    • Dart plugin version 191.8593
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b03)

[√] Connected device (3 available)
    • SM G8750   • c5976a52   • android-arm64  • Android 9 (API 28)
    • Chrome     • chrome     • web-javascript • Google Chrome 78.0.3904.97
    • Web Server • web-server • web-javascript • Flutter Tools

! Doctor found issues in 1 category.

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c: regressionIt was better in the past than it is nowc: renderingUI glitches reported at the engine/skia or impeller rendering levelf: scrollingViewports, list views, slivers, etc.frameworkflutter/packages/flutter repository. See also f: labels.waiting for PR to land (fixed)A fix is in flight

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