ability to add new tab to remembered window

[mabelrxu]

Now that we can reopen only 1 tab in a remembered window, it would useful to be able to right click a window or a tab and add a new (opened) tab next to that line to a remembered window so that I can add tabs to a closed remembered window without having to open 1 page in the remembered window, press new tab, press close and save on that tab that I opened for the express purpose of opening a new tab.