Selecting a link and typing to replace only applies link markup to first char

[kevinansfield]

If you select an entire link (or any part of a link that includes the last character) then start typing to replace the text, the link markup is only applied to the first character:

[kevinansfield]

Looking into this the reason why it happens is clear and it's no different than many other editors...

• Medium: same behaviour
• Dropbox paper: same behaviour
• Quill: same behaviour
• Google docs: removes link entirely
• Pages: removes link entirely

Both Google Docs and Pages have extra UI that allows for replacing the link text which is currently possible with mobiledoc-kit if implementors want that experience.

Closing because I think the current behaviour is probably the right approach for core.