Tim Abbott c88684d1f5 Fix first message in narrowed views never appearing. ...

The message list data structure never had the rendered_idx values
initiatized except via _maybe_rerender (called when a message is
selected).  For the narrowed message list for streams with no messages
yet, we didn't select a message (as there was none to select); the end
result is that msg_list.append() will never rerender because it tries
to subtract undefined from undefined and gets NaN in its test for
whether it needs to rerender.

So fix this by initializing _min_rendered_idx and _max_rendered_idx to
valid values for the empty message list (the closed interval from 0 to -1).

(imported from commit 6afecb1569185a842a3a9108cedba7e88f8befad)

2013-03-07 13:24:46 -05:00

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