FakeVim: Check first character on line with 'F' and 'T' commands

Change-Id: Icd5c3ca62da0fbff35e2281e04b1fa37a304f64c
Reviewed-by: hjk <hjk121@nokiamail.com>
Fix id of diff editor according to change b772001c

Task-number: QTCREATORBUG-9960

Change-Id: I233b697254e863b7c4389c0041104b82e97bd340
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>