xamarin/Xamarin.Forms

[Bug] CollectionView ScrollTo animation doesn't display elements

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#6,059 opened on May 1, 2019

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a/collectionviewe/5 :clock5:help wantedinactivet/bug :bug:up-for-grabs

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Description

Description

@icebeam7 hit this issue during his CollectionVIew challenge:

https://youtu.be/rrZrTOvFmvY?t=6504

When animation is enabled, the image doesn't appear. When disabled, it does.

Reproduction Link

https://github.com/icebeam7/CollectionViewChallenge/blob/master/CollectionViewChallenge/CollectionViewChallenge/Views/CollectionViewChallengePage.xaml.cs#L35

Contributor guide

Research direction
Examine the ScrollTo method in CollectionView and trace the animation path to understand why images are not displayed when animation is enabled. Check the provided reproduction code and test with animation disabled to compare behavior.
Tech stack
csharp
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#Xamarin.Forms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65