Watches a list of settings across a visit to the settings page, so a feature refetches only when
one of its own settings moved rather than on every save.
Parameters
keys: string[]
The settings to watch, by message key.
defaults: Record<string,unknown> = {}
The face's config defaults, read for a setting with nothing saved.
Watches a list of settings across a visit to the settings page, so a feature refetches only when one of its own settings moved rather than on every save.