Analyzer plugins fix `fixKind` works, but I can't make `multiFixKind` work

[jensjoha]

I've tried adding FixKind get multiFixKind => _theMultiFix;, static const FixKind _theMultiFix = const FixKind(const FixKind([...], DartFixKindPriority.inFile, '[...] everywhere in file') and specified CorrectionApplicability get applicability => CorrectionApplicability.acrossSingleFile; (I also tried automatically) but am never given the everywhere in file option.

Am I doing something wrong or is this not supported through the plugin system?

/cc @srawlins