Hi, thanks for taking a look. Apologies, you're right.
I've attached an updated patch, the problem before was that it was possible for a timer to be cancelled when there still existed proced buffers, which broke proced-toggle-auto-update.
To reproduce, apply the patch and then type
M-x proced-toggle-auto-update RET
The result is that the Proced display is not updated every 5 sec as
expected, and the value of proced-auto-update-timer is nil.
I've tested this with the new patch, and it works for me.
Thanks, Laurence
0001-Cancel-proced-auto-update-timer-if-no-proced-buffers.patch