Q&A: How to use the command line to create a new top-level Opera window

When I click the "quick launch" button (or whatever KDE calls them) to open a web browser, I like to have a new top-level window, not a tab of an existing browser window.

Opera, by default, creates a new tab in an existing window.  So, I hunted for a command line option to force it to create a new window.  Here are the command line options:

http://www.opera.com/docs/switches/

Sure enough, there's a -newwindow option to create a new window.  I try it, and what does it do?

It creates a new tab in an existing window.

Thanks, Opera.