Animation runs on first render, but it should not as nothing changed

[timunie]

Describe the bug
In Aura.UI there is a FloatingButtonBar which can be opened or closed via IsExpanded="true". if the page is shown you can notice that the animation is running one time to open and then close again. As IsExpanded did not change I think the animation should not run. Am I wrong here?

To Reproduce
Steps to reproduce the behavior:

1. Go to https://github.com/PieroCastillo/Aura.UI and download the source
2. Run the demo App
3. Switch to the FloatingButtonBar Example and back.
4. Notice that every time the animation runs.

Expected behavior
The animation only runs if the actual value changed, which triggers the animation

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Version 0.10.7

Additional context
original issue in Aura.UI: PieroCastillo/Aura.UI#23
feedback from the author in gitter:

mmm I saw the error maybe in the Avalonia Styling system, because the error is executed when "OnAttachedToLogicalTree" is executed

/cc @PieroCastillo

[timunie]

I put together a minimal sample which shows the issue also in Avalonia it self: https://github.com/timunie/Tims.Avalonia.Samples/tree/AnimationIssue/src/AnimationFiredTooOftenIssue

As IMO animations may be expensive, this can also be a performance issue.

Happy coding
Tim

[timunie]

Updated the sample to 11.0. Sadly, the issue is not magaically gone.