Session::sidecar_naming builds the catalog's sidecar owners (a pass over
every photo) for each photo it is asked about, so readying a synchronize
(on the UI thread) with M sidecar updates in an N-photo library cost
M·N — seconds for thousands of updates in a large library. The folder
scan had the same pattern. Session::sidecar_namings works them out once
for a list of photos; both use it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Nathaniel LedfordandClaude Opus 5.5
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