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Fix inline vector storage lifetime during subgraph updates - #86
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jcmosc merged 1 commit intoOct 21, 2026
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Repeated subgraph updates can release child subgraphs too early when the traversal stack grows beyond its 32 inline entries. After the vector moves entries to heap storage, automatic destruction of the inline array releases the stale pointer copies again.
Use union-backed inline storage so the vector alone controls element construction and destruction. Add a regression test that keeps 64 child subgraphs alive across three invalidation and update cycles and checks their values.
The regression test was verified to crash without the fix and pass with it before this change was cherry-picked onto upstream main. Tests were not rerun after the cherry-pick.
Fixes OpenSwiftUIProject/OpenSwiftUI-Samples#2.