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1. Create newPurchaseOrder schema. 2. Switch to Design View. 3. Popup menu for purchaseOrder element -> Refactor -> Safe Delete... -> Preview. 4. Expand purchaseOrder element -> Popup menu for shipTo element -> Refactor -> Safe Delete... -> Refactor. 5. Refresh preview window -> Refactor. Result: refactoring is successful, but the window still exists. It's already wrong. 6. Repeat step 5. Result: purchaseOrder element reappears! Since the scenario is rather specific, setting priority to P4.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss