Global Hotkeys don't work in Linux (Mint 19.3)

Steps to Reproduce:

1. Launch VLC 3.0.8 Vetinari in Linux Mint 19.3
2. Set global hotkeys for play/pause, pause only, play only
3. Start playing content
4. Press hotkeys
5. Minimize window to system tray
6. Press hotkeys

Expected Behaviour: Content should play or pause when pressing the hotkeys, whether the VLC window is active or hidden.

Current Behaviour: Nothing happens when pressing the hotkeys.

Related/similar bugs:

• 22098
• 21891
• 21876

Notes:

• VLC does support multimedia keys via MPRIS, however, that gets hijacked by other MPRIS-supporting apps if they're running at the same time as VLC, e.g., Opera when a YouTube video is open.
• Bug encountered on Linux Mint 19.3 using PulseAudio. Other Linux distros might be affected.