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Miguel Ángel
13af5540c1
A sub-composition mount whose data-duration ends before the host composition's window leaves its slot blank for the remainder. The runtime behavior is correct (data-duration is the slot's visible window and takes precedence), but a full-bleed sub-composition shorter than the composition is almost always an authoring mistake that fails silently (issue #1540). Add the subcomposition_blanks_before_host rule, scoped narrowly to the high-signal shape — a sole/dominant external mount starting at ~0 whose window ends before the host's — so it stays silent on intentional short clips. Document the slot-window semantics in the sub-compositions reference, distinguishing the hold-through-slot case (#911/#917) from the blank-when-shorter-than-host case.