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A timeline move/resize recorded the timing patch, then a server GSAP rewrite mutated the same file afterward, leaving the recorded after stale so an undo hit a hash conflict. The GSAP mutation now snapshots the touched files and records a follow-up edit under the same coalesceKey, with a per-entry coalesceMs override large enough to survive the GSAP round trip, so undo restores the original in one step. Applies to single-clip and group edits.