fix: flashlist scrollto behaviour v8 backport#3608
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Backports two MessageFlashList scroll-to fixes from develop: 1. Quoted-message scroll-to no longer snaps back to the bottom when the target is already in the loaded messageSet. The scrollToIndex call is re-issued inside nested requestAnimationFrames so the second one reconciles after MVCP's pending scroll fires. 2. Initial scroll-to-first-unread no longer loses the race against the mount-time scrollToEnd. Channel now exposes a hasPendingInitialTargetLoad predicate that MessageFlashList checks before running its automatic scrollToEnd on mount / autoscrollToRecent changes. Key order differs minimally from develop because V8 still enforces the sort-keys ESLint rule that develop has dropped; the patch is otherwise identical. (cherry picked from commit bc8eb82)
szuperaz
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May 19, 2026
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isekovanic
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May 21, 2026
…3609) ## 🎯 Goal In the pursuit of finding a better workaround for [this PR](#3608), I believe I've found the underlying cause (or part of it at least) for why the issue actually happens. The technical details are in [this upstream PR](Shopify/flash-list#2290) for `FlashList`. ## 🛠 Implementation details <!-- Provide a description of the implementation --> ## 🎨 UI Changes <!-- Add relevant screenshots --> <details> <summary>iOS</summary> <table> <thead> <tr> <td>Before</td> <td>After</td> </tr> </thead> <tbody> <tr> <td> <!--<img src="" /> --> </td> <td> <!--<img src="" /> --> </td> </tr> </tbody> </table> </details> <details> <summary>Android</summary> <table> <thead> <tr> <td>Before</td> <td>After</td> </tr> </thead> <tbody> <tr> <td> <!--<img src="" /> --> </td> <td> <!--<img src="" /> --> </td> </tr> </tbody> </table> </details> ## 🧪 Testing <!-- Explain how this change can be tested (or why it can't be tested) --> ## ☑️ Checklist - [ ] I have signed the [Stream CLA](https://docs.google.com/forms/d/e/1FAIpQLScFKsKkAJI7mhCr7K9rEIOpqIDThrWxuvxnwUq2XkHyG154vQ/viewform) (required) - [ ] PR targets the `develop` branch - [ ] Documentation is updated - [ ] New code is tested in main example apps, including all possible scenarios - [ ] SampleApp iOS and Android - [ ] Expo iOS and Android
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🎯 Goal
This is a backport of this PR towards V8. All details are in its description.
🛠 Implementation details
🎨 UI Changes
iOS
Android
🧪 Testing
☑️ Checklist
developbranch