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78d08b5537
This reverts commit c05ae240af EXCEPT for
the "fetch in observe" test, which I'm leaving in because we still want
a test for #2275.
This commit made it an error to start an observeChanges from within an
observeChanges callback for the same collection, but it turns out that
this is actually a somewhat common thing to do (for example, nested
'each'). Instead, we'll leave things the way they were pre-0.8.2: you
can start an observeChanges from within an observeChanges callback, but
it'll be subtly buggy in that you won't get synchronous 'added'
callbacks. This issue is described in #2315, along with the fact that
insert/update/remove/resumeObservers won't run their affected observe
callbacks if they are called from within a task on the collection's
queue. Eventually we'll implement the full fix (which relaxes the
requirement that insert/update/remove run all their callbacks before
returning) described in #2315.