Method Content::getSecondaryDataUpdates was deprecates since 1.32 and moved to ContentHandler::getSecondaryDataUpdates
However, 2 deployed extensions still override this method. The extensions should start overriding ContentHandler method.
- Gadgets
- Newsletter
After that's done, all usages of the method should be removed. Flow is the only extension that uses it in strange way, but instead we could probably just construct a new LinksUpdate there, just copy the contents of the AbstractContent::getSecondaryDataUpdates
Usage in core DerivedPageGataUpdater can be safely removed at this point.
'SecondaryDataUpdates' hook can be removed, it's deprecated since 1.32