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A drag that both moved a clip in time and restacked it fired two writers on the same file via separate queues (a targeted z-index patch and a full-file timing overwrite), so the overwrite could clobber the just-persisted z-index and the restack silently vanished after reload. The move now awaits the z-index commit before persisting timing, giving the file one ordered writer per gesture. Adds a regression test that gates the commit and asserts the timing write waits.