Music Player gets unaccessible although playback is on

[archont00]

Actual behaviour

• Tap on a music file to start Music Player.
• Press "back" arrow on top left to browse other files within Nexctloud Files.
• There is no way to to get back to the Music Player although the playback continues.
• Tapping on "Music Player" notification in Android opens Nextcloud Files App, but not the Music Player.

Expected behaviour

• When Music Player is on, an item in Nextcloud menu should appear to be able to switch to it.
• Tapping on Music Player notification should open Music Player directly.

Steps to reproduce

See above.

Environment data

Android version: 8.0.0

Device model: Samsung Galaxy S7

Stock or customized system: Stock

Nextcloud app version: 3.8.0

[ezaquarii]

@tobiasKaminsky Background playback fiasco strikes back. I'd reconsider support for it in #4208.

[ezaquarii]

@archont00 Now you can close the player with STOP button in the notification.