winner

Winner mode is a global minor mode that records the changes in the
window configuration (in other words, how the frames are partitioned
into windows), so that the changes can be "undone" using the command
`winner-undo'.  By default, it is bound to the key sequence `C-c
<left>'.  If you change your mind (while undoing), you can press
`C-c <right>' (`winner-redo').