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Remove Gesture warning when cloning the root - #35566
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Jan 19, 2026
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Currently we always clone the root when a gesture transition happens. The was to add an optimization where if a Transition could be isolated to an absolutely positioned subtree then we could just clone that subtree or just do a plain insertion if it was simple an Enter. That way when switching between two absolutely positioned pages the shell wouldn't need to be cloned. In that case `detectMutationOrInsertClones` would return false. However, currently it always return true because we don't yet have that optimization. The idea was to warn when the root required cloning to ensure that you optimize it intentionally since it's easy to accidentally update more than necessary. However, since this is not yet actionable I'm removing this warning for now. Instead, I add a warning for particularly bad cases where you really shouldn't clone like iframe and video. They may not be very actionable without the optimization since you can't scope it down to a subtree without the optimization. So if they're above the gesture then they're always cloned atm. However, it might also be that it's unnecessary to keep them mounted if they could be removed or hidden with Activity. DiffTrain build for [d343c39](d343c39)
sebmarkbage pushed a commit
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Jan 20, 2026
[diff react/react@41b3e9a6...d2908752](react/react@41b3e9a...d290875) <details> <summary>React upstream changes</summary> - react/react#35567 - react/react#35566 - react/react#35565 - react/react#35564 - react/react#35559 - react/react#35556 </details>
github-actionsBot
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Jan 22, 2026
Currently we always clone the root when a gesture transition happens. The was to add an optimization where if a Transition could be isolated to an absolutely positioned subtree then we could just clone that subtree or just do a plain insertion if it was simple an Enter. That way when switching between two absolutely positioned pages the shell wouldn't need to be cloned. In that case `detectMutationOrInsertClones` would return false. However, currently it always return true because we don't yet have that optimization. The idea was to warn when the root required cloning to ensure that you optimize it intentionally since it's easy to accidentally update more than necessary. However, since this is not yet actionable I'm removing this warning for now. Instead, I add a warning for particularly bad cases where you really shouldn't clone like iframe and video. They may not be very actionable without the optimization since you can't scope it down to a subtree without the optimization. So if they're above the gesture then they're always cloned atm. However, it might also be that it's unnecessary to keep them mounted if they could be removed or hidden with Activity. DiffTrain build for [d343c39](react@d343c39)
m-kawafuji pushed a commit
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Aug 8, 2026
…#88774) [diff react/react@41b3e9a6...d2908752](react/react@41b3e9a...d290875) <details> <summary>React upstream changes</summary> - react/react#35567 - react/react#35566 - react/react#35565 - react/react#35564 - react/react#35559 - react/react#35556 </details>
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Currently we always clone the root when a gesture transition happens. The was to add an optimization where if a Transition could be isolated to an absolutely positioned subtree then we could just clone that subtree or just do a plain insertion if it was simple an Enter. That way when switching between two absolutely positioned pages the shell wouldn't need to be cloned. In that case
detectMutationOrInsertCloneswould return false. However, currently it always return true because we don't yet have that optimization.The idea was to warn when the root required cloning to ensure that you optimize it intentionally since it's easy to accidentally update more than necessary. However, since this is not yet actionable I'm removing this warning for now.
Instead, I add a warning for particularly bad cases where you really shouldn't clone like iframe and video. They may not be very actionable without the optimization since you can't scope it down to a subtree without the optimization. So if they're above the gesture then they're always cloned atm. However, it might also be that it's unnecessary to keep them mounted if they could be removed or hidden with Activity.