Resolve FIXME from "skip tracking elements without trackable sources"
The following discussion from !1689 (merged) should be addressed:
-
@traveltissues started a discussion: after
_update_state
is removed this can be removed or simplified probably at the same time as #1194 (closed). That attribute being set in_schedule_tracking
ensures that_update_state() -> __update_source_state
returns early
requires #1054 (closed) #902 (closed)