I have a label filter that marks file modified within some time. Let's say 1 minute.
If file wasn't modified within one minute and I modify it, the file label changes immediately after file change (as the file has changed and now matches the filter).
But after one minute the file should no longer be labeled as it doesn't match the filter anymore.
DOpus seems to miss the fact that items stop matching filter criteria.
In particular, it lets you label files created "1 second ago" and then see all newly created (since you refreshed) files until your next refresh.
In general, we didn't think it made sense for labels to be changing before your eyes while you are trying to make choices based on them. So the labels remain stable until you choose to tell Opus to re-calculate them (or until the files themselves are changed, which also triggers re-calculation). We also didn't want Opus spending CPU time re-calculating labels all the time.