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Useful1 Signal3
Terminal layout can now track content drawing outside its box, but nothing uses the flag yet.
A layout flag for descendants escaping their bounds exists and is cleared on fast paths, but no code reads it.
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What
Terminal layout nodes gained a flag for having a descendant that escapes its bounds, cleared on the fast paths that skip layout. Nothing uses it yet; it is groundwork.
Evidence
hasEscapingDescendant
Strings lifted out of the shipped bundle, so the claim above can be checked against them.