The availability worker that answers "is this file there?" for the grid and the
Info panel can now also check a long list of files (every library photo's file,
for the sidebar's Missing Photos count), without that list getting in the way:
- Availability::sweep takes a list, checked one file at a time and only when
nothing is asked; files checked less than 15 s ago are skipped, and one sweep
runs at a time. The files found gone are kept (is_gone, gone_len), and
gone_generation, which replaces generation, changes only when a file is found
gone or back: a file found there at its first check changes nothing the
Missing Photos view shows, and wakes nobody.
- Availability::restart_sweeps / sweep_in drop what is left of a sweep when
another library is opened, and refuse a list that was being made for the old
one.
- Availability::sweep_yields_to takes a callback; while it says file work is
going on (an import, a scan, a folder listing), the worker starts no sweep
check. What is asked is still answered at once, and the sweep goes on where it
stopped, so a share is not asked for a stat of every file while a scan reads
it: 32 readers got 101 files/s alone and 65 files/s with one stat loop beside
them.
Nothing in the app starts a sweep yet; the worker tests exercise it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Re-applies fix/issue-104-ui-fs on top of the data-safety fixes (integrate/safety):
- availability cache: originals and smart previews are checked on a worker thread; the UI
answers from the cache (grid, Info panel, photo menu, Missing Photos view)
- import split into ImportJob::prepare (worker) + commit_prepared, with Cancel; Copy keeps
#96's verified copies
- Find Missing Photos: find_candidates (snapshot, no I/O) + plan_find_missing (all file I/O,
on a worker, never the session) with #105's matching rules unchanged (name+size+hash;
renamed by size+hash; single name+size; ambiguous look-alikes skipped and reported; files
already in use excluded). The plan is applied with library.findMissing {found, missing,
ambiguous}, re-checked against the catalog then: photos relinked meanwhile are left alone,
files now in use are not taken. library.findMissing {folder} still runs synchronously.
- Build / Discard Smart Previews with background: true runs on a worker with progress and
Stop, keeping #106's atomic writes, is_valid checks and `repaired` count (also in
library.previewProgress); the render worker's smart-preview fallback uses is_valid
- Rename preview planned on a worker (plan_rename_photos) on the same planning core as
Session::plan_rename_with (MoveFs, case-only respelling by file identity, #95)
- Local folder listing via fs_cached; tests_offline (slow injected probe, frames < 300 ms)
Tests: worker-planned Find Missing equals the synchronous command for a renamed + ambiguous
library; a plan is re-checked when applied; background smart previews repair a damaged proxy.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
