hgview #109808 filter revisions tree on revset [in-progress]

It shall be interesting to filter the revision tree depending on a given revision set (hide not matched revisions)

prioritynormal
typebug
done in1.9.0
load1.000
load left1.000
closed by<not specified>
patch[hggraph] compute revset outside of the repo grapher [applied][hggraph] handle gap in `__get_parent` [applied]