[python mode] Add regression test for #4876
[python mode] Add regression test for #4876

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