Cannot select emojis

[Reinmar]

Content:

• Foo :+1:
• Bar :+1: bom

[Reinmar]

I'm able to reproduce this in Chrome. Probably related to issues with non-editable regions at the end of the line. 

There's a slight chance that updating CKE5 will fix this issue.

[mateuszzagorski]

Fixed with #297.