Maintain popup position

[dryanovski]

At the moment, the pop-up window is always centered with the title in the menu bar, which causes it to move on every song change.

It would be great if the pop-up could stay in the same place once it's opened, allowing you to skip multiple songs without hunting the buttons. Similar to the way most browsers don't resize the tabs (when closing multiple tabs for example) until you move away from them.

Video:
https://user-images.githubusercontent.com/40567393/151567483-d5dc239e-937a-40ed-b4ed-832198028b15.mp4