Tim Abbott ca23740478 condense: Rewrite condense.toggle_collapse to be readable and correct. ...

The proposed fix in #11662 was effectively a workaround for some
already bad logic.  What we actually want to do is described in the
updated function comment (from the spec in #5914), and requires an
additionl case that was not present in the original implementation
(which effectively assumed a collapsed message was condensible).

Also add some documentation.

Fixes #11662.

2019-07-13 15:45:00 -07:00

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