How do I toggle between a Vertical and a Horizontal split in vimdiff?

Question

I already know how to use the diffopt variable to start diff mode with horizontal/vertical splits but not how to toggle between the two when I already have two file

Answer 1

The following command will change a vertical split into a horizontal split:

ctrl+w then J

To change back to a vertical split use either:

ctrl+w H or ctrl+w L

For more information about moving windows:

:h window-moving
:h ctrl-w_J
:h ctrl-w_K
:h ctrl-w_H
:h ctrl-w_L