When bulk-updating course module visibility, set_coursemodule_visibily
was triggering a partial cache purge and rebuild for each course module.
This potentially led to 2 cache sets each requiring a lock to be
acquired and released per course module, plus any other cache updates
for other changes to the course in the same request.
This adds a new $rebuildcache paramter to the
set_coursemodule_visibilty, which is true by default to retain the
existing behaviour. If set false, it will skip doing the partial purge
and rebuild for that course module, and it is up to the calling code to
ensure the cache is updated as requried.
To assist with this, there is a new
course_modinfo::purge_course_module_cache_multiple() method, which
allows multiple course modules to be purged from the cache in a single
cache set.
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