validate child index in YGNodeSwapChild and YGNodeInsertChild#1971
validate child index in YGNodeSwapChild and YGNodeInsertChild#1971netliomax25-code wants to merge 1 commit into
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YGNodeSwapChild forwards its index straight to Node::replaceChild, which reads and writes children_[index] with no bounds check, so calling it with an index past the last child reads and writes a Node* outside the children vector. YGNodeInsertChild has the same gap, where an index greater than the child count builds an invalid insertion iterator and is undefined behavior. Both now validate the index up front the same way YGNodeGetChild already does, rejecting out-of-range values before the vector is touched.