Bug 266699 [CommonNavigator] Remove CommonDropAdapter.setCurrentOperation
This has been replaced by overrideOperation() which does the same thing. Note that setCurrentOperation() was added in M5 so it's never really been API yet.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/navigator/CommonDropAdapter.java
theDropOperation, theTransferData); 
				} catch (Throwable t) {
					NavigatorPlugin.logError(0, t.getMessage(), t);
				}
				if (valid != null && valid.isOK()) {
					result = true;
					if (Policy.DEBUG_DND) { 
						System.out
								.println("CommonDropAdapter.validateDrop VALID"); 
					}					
					break;
				}
				if (Policy.DEBUG_DND) { 
					System.out
							.println("CommonDropAdapter.validateDrop NOT valid: " + (valid != null ? (valid.getSeverity() + ": " + valid.getMessage()) : ""));  
				}					
			}
		}
		if (Policy.DEBUG_DND) {
			System.out
					.println("CommonDropAdapter.validateDrop (returning " + (valid != null ? valid.getSeverity() + ": " + valid.getMessage() : "" + result) + ")"); 
		}
		setScrollExpandEnabled(true);
		return result;
	}
	/*
	 * The visibility of the following methods is raised for downstream clients
	 * (assistants).
	 */
	/*