Background saves only ever reported 0 % ("Encoding", then "Writing"), because
photocraft_io::export produced all the bytes in one call: the status bar showed an
indeterminate bar and no percentage. Now:
- photocraft_io::export_with(doc, name, opts, &Interrupt) reports encoding progress
(export keeps its signature and calls it with Interrupt::NONE, same bytes): PSD/PSB
per layer record and per composite band, layered TIFF the same plus its encoder
stages, .pcraft after its previews, flat formats once the composite is rendered.
Cancelling stops the conversion early and returns IoError::Cancelled.
- photocraft_format::atomic_write_progress writes in 8 MiB chunks and reports the
fraction written.
- The desktop save maps encoding to 0..85 % and writing to 85..99 %, 100 % once the
file is flushed and renamed.
- The status bar reads "Saving 45%" for a save (file name on hover), and the
document's tab title gets " - Saving 45%" in both tab strips, as in Photoshop.
Percentages round down so 100 % only shows when done.
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
