fix: prevent PanelStack2 from opening in the wrong direction #6847
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Thanks for your interest in palantir/blueprint, @stropitek! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request. |
evansjohnson
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Jun 22, 2024
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Thank you for the review @evansjohnson! I updated the PR based on it. |
evansjohnson
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Jun 25, 2024
| } | ||
| stackLength.current = stack.length; | ||
| }, [stack]); | ||
| const prevStackLength = usePrevious(stack.length) ?? stack.length; |
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leaving comment for posterity - technically stack.length is not the previous stack length, but it lets us not worry about handling the undefined case, and there is no animation on the initial render anyways
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Fixes #6723
As additional context that was not described in the original issue, I realized that the problem only exists when using react 18, not with react 16.
I did an example of the issue in an application running with react 18 in stackblitz, one without the fix, the other with the fix. By testing the example as described in #6723, you can verify the fix.
Before the fix: https://stackblitz.com/edit/vitejs-vite-4d5jhz
After the fix: https://stackblitz.com/edit/vitejs-vite-txizds
Checklist
Changes proposed in this pull request:
The changes removes one of the state that can be derived from other values directly, preventing unnecessary re-renders.
Reviewers should focus on:
Making sure the change does not break any existing behaviour.