I just updated to Opera 55, and now, when I right-click in the title bar (after the last open tab) it shows a new menu with options: New tab, Reopen last closed tab, and Save all tabs as speed dial folder.
Before this update, right-clicking there would open the OS window context menu, which is the easiest way to quickly re-assign any window to another virtual desktop or activity (I am working on Linux Mint).
This new "feature" is massively intrusive. I'm not sure how overriding the OS context menu for the window was ever deemed a good idea. Does anyone know how to turn this off? I've searched through the settings but can't find it.