In version 184.108.40.206, I had some code that would change the src of an attach button for a related objects list view. The code is given below.
console.log($("#dialogId > iframe").length); // returns 0 in 4.2 but works fine (returns 1) in 220.127.116.11
var myButton= $($('section[name="Attach Button Section"]').find('a'));
However, this doesn't work the same anymore in 18.104.22.168. May I know what has changed as I don't get the iframe anymore with the same code. Looking forward to your reply.
I have just added an idea for this: