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Looks as though the Collapse/Expand shortcuts do not work in 3.1. I tried to define and use them on the worksheet, code editor, autotrace panel, and so on. They don't work in 2.0 either, where they were first introduced during a rewrite from the 1.5.x versions.
Problem is, they might work somewhere in the product, but I have no idea where that might be. Perhaps someone else can comment. I do not see any bugs logged in this area, another clue this is not a regression in prior behavior.
If no one else comments and provides a lead, probably the best course of action is adding this as Feature Request on the SQL Developer Exchange.
SQL Developer Team