multiple active contexts: honour the status icon’s custom colour, if only one context is active.
multiple active contexts: status-text now displays all contexts.
Note: presently it doesn’t show context-paths, to conserve space, but the code to do so is just commented-out. we could add a pref to switch it on, later.
multiple active contexts: walk up context-tree, when triggering actions for child.
Note: this brings parity with single-active-context behaviour.
multiple active contexts: don’t trigger departure actions for a parent with other, active children