Occasionally I have a stray forgotten buffer in which I ran
:diffthis. Later when I run
:diffthis on some unrelated buffer that second buffer is immediately and unintentionally highlighted with the diff. At this point I don't know which buffer is the first in which
:diffthis was run and I don't know how to
:diffoff on that buffer.
How do I solve this? Can I simply
:diffoff on all buffers, even buffers not in any window?