is a variable defined in `
Its value is
- Automatically becomes buffer-local when set.
Timing details for the last cooperative decoration action.
This is maintained when `allout-widgets-time-decoration-activity' is set.
The value is a list containing two elements:
- the elapsed time as a number of seconds
- the list of changes processed, a la `allout-widgets-changes-record'.
When active, the value is revised each time automatic decoration activity
happens in the buffer.