My tasklist app publishes Notifications for tasks with certain properties via qml.
When the app or phone crashes, these notifications are left in place.
Is there a way to remove all notifications published by my app?
You already cleanup your notifications in Component.onDestruction callback… I am worry, that you cannot do something more when your application crashes. In C++ code you can register own abort signal handler, fork new process from it and try to solve situation… But it seems to me like a overkill. I may suggest to focus to avoiding crashes 
Yes, when the app exits clean, removeAll cleans the notifications and my app doesn’t crash 
.
But sometimes all apps get killed by the system (when it runs out of memory?) or the device reboots itself, then the notifications are left in the notification area.
Not a big deal, but would be nice to solve.
Do you want to clese automatically when crashed? This is not possible. But you can save https://sailfishos.org/develop/docs/nemo-qml-plugin-notifications/qml-nemo-notifications-notification.html/#replacesId-prop values to close it later.
Or you can fix crash of your application
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Saving the ids should work, thanks. 