Steve Howell cc6c0104c8 Refine compose box behavior for topic narrows. ...

The comments that were added in the code for this commit explain
the cases here, but essentially for topics, we need to decide
among a few possible behaviors with regard to composing:

- Leave it closed.
- Cancel the compose.
- Leave the compose box as it was before.
- Fill in the new topic.

Before this commit, we were cancelling compose in all cases (or
leaving it closed).

Now we leave it alone in some cases where there is already content.
And we fill in the topic when the stream was correct and the topic
was empty.

Fixes #3300

2017-04-20 16:15:07 -07:00

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