Playlist playback consistency

Checklist

• I am using the latest version - Version 0.20.2 x.xx.x
• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one bug. I will open one issue for every bug report I want to file.

Steps to reproduce the bug

1. Open playlist with multiple entries

2. Click on a video or long press a video and select 'start playing on pop-up' or long press and select 'start playing at background'

3. For the first two, the app only plays selected/clicked video. Whereas background playback enqueues whole playlist playing selected files.

Actual behaviour

Clicking on a video or 'Start on pop-up' only plays selected file 'Start on background' enqueues playlist and plays selected file

Expected behavior

All three playback methods should have the same behaviour. And since we are in a playlist it should follow the behaviour of 'Start playing in background', where selected file is played and the whole playlist is queued

Screenshots/Screen recordings

Device info

• Android version/Custom ROM version: 10 / LineageOS 17.1