RCP: X.X, units annotation toolbar list widget
problems :
- focus
- UP&DOWN keyboard arrows events: go to previous/next unit, cycle through units
- Page UP&DOWN keyboard arrows events: go to –10 previous/ +10 next unit, cycle through units
- mouse up/down wheel events: go to previous/next unit, cycle through units
- UP&DOWN widget button arrows events: go to previous/next unit, cycle through units
- unit id input (e.g. go to unit with ID=MENTION-500)
- activate auto-completion with CTRL+SPACE shortkey
(from redmine: issue id 1994, created on 2017/01/12 by Matthieu Decorde)