MPRIS interface not exposed by Flatpak
The org.gnome.Epiphany.Devel
Flatpak from GNOME Nightly does not expose the MPRIS dbus interface for media controls.
According to #1453 (comment 1320190) MPRIS support must be enabled for the SDK’s WebKit build. What is required to get this working? Can we enable the (afaict still experimental) MediaSession feature in the SDK?