Tim Abbott dbbd3627b5 message_list: Show empty narrow notice after emptying narrow. ...

If muting, topic editing, or deletion causes a narrow loses its last
message, we should show the empty-narrow notice; similarly, if
un-muting adds the first message, we should hide the notice.

We do this in `rerender()` since that's the common code path for
re-rendering the message list after events that might change this.

This has likely been broken since the very first muting
and topic editing implementations.

2018-04-13 16:31:18 -07:00

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