How to have a window in 2 workspaces?
I came from using wmii with gnome and I am loving i3 so far. However one great feature of wmii was that I could have the same window in several workspaces with different sizing.
So in the one workspace I had my browser next to a terminal, in another the same browser alone and in another the terminal alone. In that way I could quickly change the layout I wanted to use without having to use fullscreen (the problem with fullscreen is that you miss notifications).