Game Mechanics: FD + Open Trade Window + CoS = Trade Window stays open?

[Anichek]

Talked to someone tonight who was asking if they could CoS after opening a trade window and still be able to be invis while vendoring to do a quest turn in. I thought no - any invis would break the trade window from being open. Advised them to try a FD turn in....

...they were able to FD, then open the trade window, then stand and CoS to invis, and the trade window stayed open.

Not sure if this is a true bug, but posting for review in case it is.

[Thulack]

FD turnin item will get eaten so i wouldnt recommend that to anyone else. but the other thing you yes you can invise yourself after you open trade window.

[pasi]

You can open a window and then hide/sneak/CoS and turn in as indifferent. You don't open the window while FD though.

This was used to skip a lot of epic steps back in the day, and still works to date on live.

If you go back and look at the epic MQ bug thread, I do this to turn in the rogue epic with a SK thats KOS to Stanos.

[jeremy0818]

Isn't FD turn in something that was fixed/nerfed during velious?