Ongoing notification

[simonesestito]

Avoid dismiss the notification because an error. To close it, you can use the appropriate button.

[tananaev]

I'm not convinced that it's a good idea. Some people might find it annoying that you can remove it with a swipe.

[simonesestito]

I found the swipe annoying, so I forked the repo and "fixed" it myself. I don't know what other people want

[tananaev]

I'll watch for feedback from people and maybe merge it in future. Thanks for pull request.

[hmueller01]

I find it annoying that calculator notification goes away with "clean all". So I forked the repo and added .setOngoing(true) to the notification builder. I havn't seen this pull before and was about to write a pull by myself. But @simonesestito 's solution is much more sophisticated and I vote for that pull!

[tananaev]

If we can make it configurable, I'm happy to accept this change.