Summary

Unlinking some types of valid URLs cause the URL to be encoded again and become invalid.  

Steps to Reproduce

1. Paste a URL with a character from this list. Example: http://www.example.org/?foo=bar&gtin=4049999990004.
2. Save the page.
3. Edit the page and unlink the URL.

Expected Results

• The URL is not modified after unlinking and remains a valid URL.

Actual Results

• The URL is encoded in the source as http://www.example.org/?foo=bar&gtin=4049999990004, so that it ends up being doubly encoded after unlinking.  The link http://www.example.org/?foo=bar&gtin=4049999990004 turns into http://www.example.org/?foo=bar>in=4049999990004 on the page.

Workaround

There is no workaround at this time.