demandimport: blacklist sqlalchemy.events as it has side effects (issue5085)...
demandimport: blacklist sqlalchemy.events as it has side effects (issue5085)
Importing sqlalchemy.events cannot be delayed as it registers classes to
their event mechanism. It worked fine before 4f1144c3c72b, since they use
new-style imports. But now we have to blacklist it because our demandimport
can handle new-style imports.
This patch series isn't intended for stable as we don't guarantee API
compatibility with 3rd-party extensions. They can temporarily disable the
demand importer to work around the issue.