Animation's ComputeFromValue is not working correctly

[MartinZikmund]

Current behavior

The Expander style in WinUI has the following in CheckedPointerOver VisualState:

  <contract7NotPresent:DoubleAnimation
      Storyboard.TargetName="ExpandCollapseChevronRotateTransform"
      Storyboard.TargetProperty="Angle"
      To="180.0" Duration="0:0:0.1"/>

However, the same is in the Checked VisualState to accomodate for keyboard navigation. When the animation finishes, the final value is kept, so subsequent pointer hover should not cause further animation (as the effective From value is already 180.0). However, in case of Uno, the chevron snaps to angle 0 and rotates quickly.

Expected behavior

No animation should occur on poitner over.

How to reproduce it (as minimally and precisely as possible)

No response

Workaround

Our current workaround in Expander_themeresources.xaml was to replace all ocurrences of Duration="0:0:0.1" by Duration="0:0:0". Revert this workaround to see the broken behavior.

Works on UWP/WinUI

Yes

Environment

Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia, Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia

NuGet package version(s)

No response

Affected platforms

No response

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

[MartinZikmund]

@dr1rrb assigned this one to you, maybe it was reported in some other form before

[jeromelaban]

@MartinZikmund nice. Is it related to the expander chevron ?

[MartinZikmund]

@MartinZikmund nice. Is it related to the expander chevron ?

Yes, exactly. For now I worked around it by removing the animation

[dr1rrb]

@Xiaoy312 is it something you are currently working on?