No problem, I did it by accident, and you can also drag the windows to the corners and overshoot to have them, top is full, left and right is half that side, the link you posted mentions that, I am actually surprised you never accidentally discovered either. I have that in KDE as well.
Also, double-clicking on a top or a bottom edge will v-maximize window, or resizing a window vertically and overshooting at the top or at the bottom of the screen.
