docgnome/pomodoro.el — pull request #4 by DerGuteMoritz (2012-09-18 08:02:35+00:00)
Title: Cancel timer on pomodoro-start when one is already running

Without this patch, calling pomodoro-start multiple times turns
pomodoro-mode into sisyphus-mode as there is no way to stop the timers
started before the last one anymore. With this patch an already
running timer is stopped before starting a new one.