Opening a saved session in Opera creates a new window. Currently, I would prefer to reuse the current window, i.e. to append the saved tabs to the current ones (if any).
Is there a dedicated setting or extension that can achieve this?
Note that the Manage Sessions dialog contains an option that does exactly that. However, I'm looking for something that applies when opening sessions from the menu or any toolbar in the main UI. It should also persist, unlike the Manage Sessions option, which resets whenever the dialog box closes.