FCP 7 XML / FCPXML nested about 1 000 elements deep overflowed an 8 MiB stack in the XML
parser (aborting the app). Import now scans XML and OTIO JSON nesting first and returns
Error::TooDeep beyond 256 levels.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Removes the six expect() calls from timeline export/import and denies the panic lints in the
crate. A precomp layer whose source item is not a composition (a damaged project, or an item
that was deleted) made export panic in Exporter::sequence; it now leaves that layer out.
Exporter::sequence and track_item return Option, the Motion/Opacity/Volume effect defaults
come from effect_or_new (None if FilmCraft's registry lacks one), and import's motion() skips
a layer without a transform group.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
