How to Stop special character conversion of & to &

[Sibasish palo]

Steps to reproduce

<A class=external href="​http://www.test.co.uk?id=test&amp;test=test&amp;testing=testing" rel=nofollow target=_blank data-cke-saved-href="​http://www.test.co.uk?id=test&amp;test=test&amp;testing=testing"> ​http://www.test.co.uk?id=test&amp;test=test&amp;testing=testing </A>

Original content: ​http://www.test.co.uk?id=test&test=test&testing=testing

content changed by ck editor ​http://www.test.co.uk?id=test&amp;test=test&amp;testing=testing

Expected result

Display text of <a> tag having "&" should not change to "&amp;"

Actual result

"&" is changed to "&amp;"

how do i stop automatic conversion of <a> tags display text having "&"

[Jakub Ś]

DUP of #9282

Although ticket is 3 years old, what’s written there is still valid.