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Andrew Clark
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* [FORKED] Add HiddenContext to track if subtree is hidden This adds a new stack cursor for tracking whether we're rendering inside a subtree that's currently hidden. This corresponds to the same place where we're already tracking the "base lanes" needed to reveal a hidden subtree — that is, when going from hidden -> visible, the base lanes are the ones that we skipped over when we deferred the subtree. We must includes all the base lanes and their updates in order to avoid an inconsistency with the surrounding content that already committed. I consolidated the base lanes logic and the hidden logic into the same set of push/pop calls. This is intended to replace the InvisibleParentContext that is currently part of SuspenseContext, but I haven't done that part yet. * Add previous commit to forked revisions * [FORKED] Track nearest Suspense handler on stack Instead of traversing the return path whenever something suspends to find the nearest Suspense boundary, we can push the Suspense boundary onto the stack before entering its subtree. This doesn't affect the overall algorithm that much, but because we already do all the same logic in the begin phase, we can save some redundant work by tracking that information on the stack instead of recomputing it every time. * Add previous commit to forked revisions