The i18n used.
The top-level nodes.
The locale used.
The mode used; auto resolves to one of the others.
Always true here; a failed call resolves with ApiFailure instead.
OptionaltargetA fingerprint of the tracks the menu was built for, to pass back as expectTarget. Absent for mode: "playlist". Opaque, and valid only while the host process runs.
The withAvailability used.
Successful response from
menu.getContextMenu.