Make lookAhead work in mode tests
Make lookAhead work in mode tests

Issue #4868

pabloferz/CodeMirror,codio/CodeMirror,codio/CodeMirror,namin/CodeMirror,namin/CodeMirror,jayaprabhakar/CodeMirror,MarcelGerber/CodeMirror,hackmdio/CodeMirror,MarcelGerber/CodeMirror,nightwing/CodeMirror,mtaran-google/CodeMirror,namin/CodeMirror,pabloferz/CodeMirror,SidPresse/CodeMirror,ficristo/CodeMirror,thomasjm/CodeMirror,nightwing/CodeMirror,nightwing/CodeMirror,dperetti/CodeMirror,pabloferz/CodeMirror,dperetti/CodeMirror,SidPresse/CodeMirror,ficristo/CodeMirror,jayaprabhakar/CodeMirror,SidPresse/CodeMirror,notepadqq/CodeMirror,thomasjm/CodeMirror,MarcelGerber/CodeMirror,wingify/CodeMirror,notepadqq/CodeMirror,hackmdio/CodeMirror,thomasjm/CodeMirror,codio/CodeMirror,dperetti/CodeMirror,jkaplon/CodeMirror,hackmdio/CodeMirror,mtaran-google/CodeMirror,wingify/CodeMirror,wingify/CodeMirror,ficristo/CodeMirror,jkaplon/CodeMirror,jayaprabhakar/CodeMirror,mtaran-google/CodeMirror,jkaplon/CodeMirror,notepadqq/CodeMirror