Well, for some of us, it was REALLY useful. I used to click on the name of the window (like Window 1) that I want opened in my current window. Now I need to go to the upper corner, click on open, and then click on "open in current window".
I thought I had a buggy version and even reinstalled before I found out it was removed purposedly. Can you at least add an option in the settings menu where you can set up your default action, so it would not interfere in the main interface?
Thanks for the amazing work.