[DAEMON-135] appcd-detect: First change rescan emits new event eventhough nothing changed
|Appc Daemon 1.0.0
When the detect engine is watching a folder where something changes, it triggers a rescan. The first time the rescan is done, the results are merged into the observable model and even though nothing has changed, it will emits an event. It should only emit an event when A) something of interest happens and B) the result has actually changed.