Always unknown: foobar2000 does not report whether the command finished or whether a dialog it opened was cancelled.
OptionaldynamicWhether it was a dynamic child command.
OptionalguidGUID of the command that ran, including calls resolved from names or paths. Older hosts can omit it for those forms.
OptionalsourceHow a name or path was resolved: v2-tree by the menu tree, index by the command list. Absent for the GUID form.
OptionalsubGUID of the dynamic child that ran.
Always true here; a failed call resolves with ApiFailure instead.
Successful response from
menu.runMainMenuCommand.