FWIW, I am attaching two patches.  If you want any changes please do it
yourself.

patch-1 :: There is only one command 'x' - which hides state at point.
patch-2 :: `x' hides up-to-date and `C-u x' hides state at point.

Personally, I will go with patch 1.  It is simpler.  No prefix key is
used.

Btw, reviewer who takes infinite time to review could either be a
perfectionist or a procrastinator :-).