This is a new feature in libnotify causing transitions to vanish after they've been displayed.
…clue what's wrong)
…lers registration should happen before any subprocess creation (fsevent_watch for instance) to be properly catches by the subprocess. Note that in the case when guard is run via bundler, this –quoting @ttilley– "would make this an unsolvable problem" (isn't it dramatic?! ;)).
… as key for actual string keys in the hash).