support for tap handling without having a strong reference to the not…

[alemar11]

support for tap handling without having a strong reference to the notification itself

[problame]

Hi @alemar11,

thanks for your contribution. I think the way you implemented the tap handler should be the default and only way.

Please replace the current tap-handler with your implementation (so there is only one tap-handler property, code path, etc) and I will be happy to merge.