<![CDATA[
                   +-------------+
                   |+-----------+|
                   ||           ||
            +------>|   idle    |<--------+
            |      ||           ||        |
            |      |+-----------+|        |
            |      +------+------+        |
content     |             |               | idle timeout
msg. sent   |             | composing     | w/o activity
----------- |             | ------------- | ------------------
 --         |             | "active" msg. | "idle" status msg.
            |             |               |
            |      +------V------+        |
            |      |             |        |
            |      |             |        |
            |      |             |        |
            +------+   active    +--------+
                   |             |
                   |             |------+
                   +------^------+      | refresh timeout
                          |             | --------------------
                          |             | "active" status msg.
                          +-------------+
]]>