IssueTracker

Project: platform/frameworks/support
Branch: androidx-master-dev

commit 47c5e9d30d0304a7d1ac6a522c01a055b858ff28
Author: Jeremy Woods <jbwoods@google.com>
Date:   Mon Aug 24 14:47:02 2020

    Use view alpha to store the view animation state
   
    Currently when using the new state manager, we save the visibility of
    the view from onViewCreated() to do proper effects. This visibility
    is restored after onStart() when any special effects are complete.
    Because we always restore the visibility to whatever it was in
    onViewCreated(), we fail to capture any changes that could have been
    made by the user between onViewCreated() and onStart(). This means if
    view animating in is set to INVISIBLE in onStart(), we force it back to
    VISIBILE once the animation is complete.
   
    Since there are still cases where users set their visibility directly on
    their views, we need to ensure we are backward compatible. To do so,
    instead of storing the view visibility, we should use the view alpha.
   
    Anything above an alpha of 0 is considered visibile. Doing this means we
    can handle the case where the visibility is changed, but the
    suggestively more rare case of the alpha changing will suffer from the
    old issue.
   
    Test: FragmentViewTest, PostponedTransitionTest
    Bug: 164481490
    Change-Id: I9df6398af8e0404638e83b69319e4bd32bdbc3f2

M       fragment/fragment/src/androidTest/java/androidx/fragment/app/FragmentAnimationTest.kt
M       fragment/fragment/src/androidTest/java/androidx/fragment/app/FragmentAnimatorTest.kt
M       fragment/fragment/src/androidTest/java/androidx/fragment/app/FragmentViewTest.kt
M       fragment/fragment/src/androidTest/java/androidx/fragment/app/PostponedTransitionTest.kt
M       fragment/fragment/src/main/java/androidx/fragment/app/Fragment.java
M       fragment/fragment/src/main/java/androidx/fragment/app/FragmentStateManager.java
M       fragment/fragment/src/main/java/androidx/fragment/app/SpecialEffectsController.java

https://android-review.googlesource.com/1404407