Restore wed edition features
Only a handful mostly superficial things were missing for the Edit/Replace features to work, and I got a first successful change with the Web IDE.
I've checked that the underlying code won't publish any changeset if this is done on a topic.
Still, I think the Web IDE could still be dangerous, if someone starts from a topic and creates a change set in a new named branch. That would publish the new changeset and its ancestors (the topic).