Change handling of OpenLineAbove to fix first line edge cases
Change handling of OpenLineAbove to fix first line edge cases

Fixes #877

Somasis/kakoune,alexherbo2/kakoune,lenormf/kakoune,jkonecny12/kakoune,casimir/kakoune,jkonecny12/kakoune,flavius/kakoune,ekie/kakoune,danr/kakoune,casimir/kakoune,alexherbo2/kakoune,mawww/kakoune,alexherbo2/kakoune,Somasis/kakoune,mawww/kakoune,mawww/kakoune,jkonecny12/kakoune,Somasis/kakoune,jjthrash/kakoune,jkonecny12/kakoune,ekie/kakoune,alexherbo2/kakoune,lenormf/kakoune,ekie/kakoune,flavius/kakoune,Somasis/kakoune,occivink/kakoune,danr/kakoune,danr/kakoune,jjthrash/kakoune,occivink/kakoune,casimir/kakoune,flavius/kakoune,jjthrash/kakoune,casimir/kakoune,mawww/kakoune,flavius/kakoune,occivink/kakoune,ekie/kakoune,occivink/kakoune,lenormf/kakoune,lenormf/kakoune,danr/kakoune,jjthrash/kakoune