[Sync to Gitee] - Feature/accept by line new (#97) * Accept by line. * Accept by line. * Accept by line. * Completion by line accept display fix. * Completion by line accept display fix. * Ctr + z undo fix. * Ignore multi-caret model completion

[Sync to Gitee] - Feature/accept by line new (#97) * Accept by line. * Accept by line. * Accept by line. * Completion by line accept display fix. * Completion by line accept display fix. * Ctr + z undo fix. * Ignore multi-caret model completion #55