I'm using Tower for Git. On a commit, I clicked "Difftool". This launches my merge program (P4Merge). It launches it for every file that needs to be diffed, one at a time. So every time I close P4Merge, the next diff is opened. Tried quitting Tower, no luck. There's hundreds of files. I have to reboot to stop it.
How can I prevent an app from opening continually, or erase the queue that is launching it?