password_confirm field: second box not highlighted and multiple error messages possible

First, the second box in the password_confirm field does not get highlighted if an error exists on the field. This is fixed by the last change in the patch:

+ form_error($form['pass2']);

Multiple error messages can be displayed for the field if a module performs some validation on the field (such as password length). For example, say the module has a password_confirm field called 'password' and validates on password length. The field is required and no password has been supplied in the first text box. If the module developer chooses to use form_set_error('password', 'Blah') both the 'Blah' message and the required message from password_confirm_validate are displayed.