The SimplePie-Upgrade (
FS#2708) broke at least the gallery plugin (produces a fatal error, see
https://github.com/splitbrain/dokuwiki-plugin-gallery/issues/25). As we did not deprecate any of the no longer existing SimplePie functionality (I'm not sure if it's just that one function) I think we should re-add the missing parts in order to ensure compatibility with the old SimplePie version and remove them later according to our deprecation plan.