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[Bug]: check shouldRevalidation before cancel a loader #12105

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BrianWoolfolk
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Closes #12007

The normal behavior is:
fetcher1.load() gets cancelled if a fetcher2.action() is called, then the fetcher1.load() is called again because of revalidation.

The problem (bug?) is that a cancelled loader would always get revalidated, which means that fetcher1.load() is called two times (even though the first execution is aborted, it could mean a double API fetch).

Suggested behavior:
Check if a loader shouldRevalidate before it gets cancelled (because if not, we can just let it resolve).

This PR is a draft, because this same solution conflicts with things like error-throwing and redirections (and it also breaks some other tests) and wanted to hear your takes on this problem.

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remix-cla-bot bot commented Oct 9, 2024

Hi @BrianWoolfolk,

Welcome, and thank you for contributing to React Router!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

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remix-cla-bot bot commented Oct 9, 2024

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

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