[orca-list] Orca jumps multiple lines when I move with ctrl+right on a web page

[Alex ARNAUD <alexarnaud hypra fr>]

Hello all,

Environment:
- Debian Sid
- Orca master
- Both Firefox 59.0.2 and Firefox ESR 52.7, e10s doesn't impact the result.

Steps to reproduce:
1) Open this page: 
http://www.liberation.fr/planete/2018/02/08/john-perry-barlow-le-net-perd-sa-connexion-libre_1628470
2) Search for line with "autorités de pouvoirs éloignés"
3) Move with ctrl+right to move between word until to go after "Barlow"

Result: The caret switches back on "Lyrique, le texte convoque à la fois 
la Déclaration"
Expected result: The caret should switch on "et la «noosphère»"

Best regards,
Alex.