[comment addon] Don't ignore content on last selected line when block-uncommenting
[comment addon] Don't ignore content on last selected line when block-uncommenting

Closes #5059

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