Notification summary

When i want to dismiss a notification in the notification summary window to the screen is moving down and i go back up to dismiss others

Also there is no dismiss all notifications form a single app at once so if an app has 10 notifications in the summary I have to swipe left 10 times to dismiss it, and with the problem i mentioned above it is very annoying.

So I suggest to:

1- fix the move down bug

2- add clear notifications at once by app from notification summary