The boot trim alone let a long session grow the folder past the budget
again (an early release reached 1 GB). A trim now also runs on the
blocking pool every 16 MB of new originals, the budget comes from
ui_prefs image_cache_max_mb (100/200/500/1000 MB, 200 default), .img files
with no row older than an hour are swept at boot, and the settings
document carries the stats, the size options and a clear action.
cc