Commands clamp every position they take to ±2^40 samples so the
arithmetic after them can't overflow, but session and clip group files
skipped that. A clip, MIDI note, marker, automation point or selection
near i64::MAX made Duplicate, Insert Silence, Insert Time, Heal, Trim to
File Boundaries, Quantize to Grid, Separate on Grid, Thin Automation,
Copy, Move Selection, Extract Chords and Track Commit overflow: a panic
in debug builds, wrapped positions in release.
MAX_POSITION moves to soundcraft-time so the model can use it. Loading
a session clamps clip starts, lengths, offsets, sync points, gain
envelopes and MIDI notes, automation points, markers, key changes, the
selection, playhead, pre/post-roll, scroll and timecode start. A clip's
repairs are now Clip::sanitize, which clip group import uses too, and
Session::sanitize visits each collection once. The Edit window adds a
clip's offset to its file's time stamp without overflowing.
grovebit