I'd like to have a "new tab" button much like Chrome or Firefox has for my QMdiArea. I can make a button or menu item somewhere that adds a new subdocument to the MDI thing, but how can I make it ...

I see that QMdiArea has a tabbed view mode. I want to be able to split the main window with two QMdiArea widgets and to be able to drag and drop tabs between each of them. I have already done it wi...