Previously, the button in the notification simply changed from pause to play when pausing media playback, but now I also get some animation looking as if the notification disappears and is then immediately replaced by a new notification. Resuming playback still works normally, i.e. the play/pause button simply changes its state without any further animations of the whole notification.

Currently on PTO, NI-ing Andrew to take a look at this

Andrei, could you have a look please? thanks

Regression window range: Last good build: 07-16 First bad build: 07-17 Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=2d4bb9aa2e342902f53ce80ac155e97cffde34bc&tochange=65677fe92b47b6a48984c204899803283f1c44e6

What's slightly worse is that according to bug 1484679, if the media control notification is the only notification showing, then this behaviour causes the notification shade to close.

Instead of stopping the foreground service whenever ACTION_PAUSE was triggered, I created a new event where we notify the service to clear its foreground state. Cleared usages of the NotificationManager and the onGoing attribute of the MediaNotification because they are redundant. As of Android 4.3 a service in the foreground state will always force the notification to be persistent and callling stopForeground(false) will clear the onGoing flag while maintaining the notification.

Comment on attachment 9004929 [details] Bug 1479314 - Prevent media control notification flashing. r=sdaswani Jim Chen [:jchen] [:darchons] has approved the revision.

Pushed by ccoroiu@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/0851a63dc3bb Prevent media control notification flashing. r=jchen

Verified as fixed on the latest version of Nightly 63.0a1 (2018-09-03). Devices: Nokia 6 (Android 7.1.1) and OnePlus 5T (Android 8.1.0).