Steve Howell 616a06e5b2 Use msg_list.fetch_status instead of load_enabled. ...

We now attach a fetch_status to message lists, so that they
can track their fetch status individually.  When you go
back in a narrow and get all the older messages, we turn
off future fetches.

The narrow.js code no longer needs to orchestrate anything
here.  The "home" message list won't have as many redundant
fetches after this commit, because we don't need to reset
flags every time we do `narrow.deactivate`.

And then actual narrows get a new message list every time
you narrow, so their fetch status gets reset implicitly
as part of constructing the MessageList object.

2018-03-09 14:20:58 -08:00

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