https://www.example.com/phase3/index.php?title=Special:ChangeEmail&returnto=Special%3APreferences

When you are on Special:Preferences and try to change a confirmed e-mail address x to the same value x (to trigger a confirmation mail, for test purposes or the like),

• the mail address change screen is shown and you can enter of course the new address

Change account e-mail address

Complete this form to change your e-mail address. You will need to enter your password to confirm this change.
Username: WikiSysop
Current e-mail address: x
New e-mail address: x
Password: y

Problem

When you now press "Change e-mail", there is neither a confirmation message
"... has been sent" shown, nor an error message like "you tried to change your mail address to the previous value. Instead, the process flow goes back to Special:Preferences

Suggestions

i) show the user an info message (that no confirmation mail has been sent because the mail address was not sent) -- or --
ii) to go again trough the full confirmation procedure including sending an confirmation mail.

(pls. feel free to shorten the bug summary text)

Version: 1.21.x
Severity: minor