Try to complete command switches when an argument starts with '-'
Try to complete command switches when an argument starts with '-'

Fixes #1467

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