URLs with Query Strings are NOT Tracked in HTML Messages

If you create a LINK in the HTML message body which includes more than one element in the query string, the editor correctly converts the ampersands into the corresonding character entity ("&"). HOWEVER, this causes the function which identifies Trackable URLs to ignore the link. Given that links to CiviCRM pages for contributions and events will fall into this bug - we should fix this.

To recreate:

• Create a Mailing using the Compose method and create a link using the Editor "Link" tool.

• Link URL:
  http://sandbox.civicrm.org/drupal/civicrm/admin/uf/group/field?reset=1&action=browse&gid=1

• If you view the HTML source in the editor, you'll see that the above is converted to:
  http://sandbox.civicrm.org/drupal/civicrm/admin/uf/group/field?reset=1&action=browse&gid=1

When you do a test (or live) mailing with Click-thru enabled, you'll see that this Link is NOT tracked.

I "think" this is a problem with the regex in CRM/Mailing/BAO/TrackableURL.php - but not sure.