Implement execCommand link and unlink
I'm going to split UnLink off into it's own bug
Created attachment 7066 [details] patch Another way to do this would be to pull out the parts of ApplyStyleCommand that apply style to text runs from the parts that do the setup, traversal and cleanup, and make two new classes, PushInlineChangeCommand and ApplyInlineStyleCommand, with CreateLink and ApplyinlineStyleCommand as subclasses of PushInlineChangeCommand. That's more risky and probably not worth the effort unless we think we'll end up needing PushInlineChange in order to implement something else.
Comment on attachment 7066 [details] patch Slighly odd way to do it. r=me