[hooks selection optimization] prune hooks when multiple entities are concerned by a hm.call_hooks() (closes: #1672022)
the idea is to make a first pass over all the hooks in the registry and to mark
put some of them in a disabled list. The disabled hooks are the one which:
* are disabled at the session level
* have a match_rtype or an is_instance selector which does not
match the rtype / etype of the relations / entities for
which we are calling the hooks. This works because the
repository calls the hooks grouped by rtype or by etype when
using the entities or eids_to_from keyword arguments
Only hooks with a simple selector or an AndSelector of simple
selectors (is_instance and match_rtype) are considered for disabling.
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""" CW - nevow/twisted client
"""