I just discovered the existence of masked tags and of the "Screen"
mechanism to exclude some tags. I also notice that they are
displayed together with overriden tags when you use --show-overrides.
Yet they are very different.

I believe that a tag that lintian decided to suppress should simply never be
emitted, not even as a masked tag. Thus I would suggest to stop emitting
masked tags.

But if you disagree with this, it might make sense to offer the
possibility to handle masked tags separately from overriden tags.

(Again this is a followup from a discussion here
https://salsa.debian.org/freexian-team/debusine/-/merge_requests/300#note_434002)