Steve Howell 44f575c812 Add topic-zooming hooks. ...

This commit doesn't actually add the final UI to zoom/unzoom
topics, because I want to keep those in separate commits, in
case we change how to enable the feature.  But this commit
adds a toggle_zoom() function that zooms/unzooms topics.

Zooming is minimally invasive, because we don't really introduce
many extra elements to the UI; instead, we just make the list of
streams be a list of length one (i.e. the active stream).  This
gives us a lot of stuff for free, basically, like unread counts, etc.

(imported from commit 814c1361b6210d1591b4174bed1d6e0c98a3f255)

2013-11-26 10:34:08 -05:00

1.5 KiB

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