The thumbnail caching continuously sends `ND_SPACE_FILE_PREVIEW`
notifiers via a timer. But this timer was never ended properly after
thumbnails are fully loaded into the cache.
Wouldn't actually cause a refresh or redraw, send and process the
notifiers.
I already tried to avoid this for the asset view template, but
apparently that wasn't working correctly. For the File/Asset Browser I
never applied that fix to avoid possible regressions before the release.
d552b3c0c0