The thumbnail cache wrote .jpg files into the library's thumbs folder, which is usually inside
Pictures: photo galleries listed every thumbnail as a photo (issues #610, #1066), and every read
brought the file's date forward, so each launch made them all look new.
- Cache files are named <32 hex>.lcthumb (JPEG data as before). A .jpg of before is taken over
under the new name when it is asked for; the rest when the cache is tidied, which the engine does
once per cache folder, on a thread of its own with a row in the activity stack that shows its
progress and can stop it. Nothing is rendered again.
- Reading writes nothing: what was read is remembered for the session (a full cache lets it go
last), and only a file that went unused for a week has its date brought forward.
- A folder that holds nothing but the cache gets a CACHEDIR.TAG, when the cache makes it and when
it is tidied; one that also holds somebody's files is not tagged (issue #98).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
