Bug 52064 Content assist in "New Class" Dialog shows interfaces
Content Assist is available for the superclass in M7. However it also lists interfaces. If an interface is selected, the generated class "extends" it instead of "implementing" it.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
if (JavaConventions.validateJavaTypeName(text).isOK()) {
				typeName= text;
			}
		}
		setPackageFragment(pack, true);
		setEnclosingType(enclosingType, true);
		setEnclosingTypeSelection(false, true);
	
		setTypeName(typeName, true);
		setSuperClass(initSuperclass, true);
		setSuperInterfaces(initSuperinterfaces, true);
	}		
	
	
	
	/**
	 * Creates a separator line. Expects a <code>GridLayout</code> with at least 1 column.
	 * 
	 * @param composite the parent composite
	 * @param nColumns number of columns to span
	 */
	protected void createSeparator(Composite composite, int nColumns) {
		(new Separator(SWT.SEPARATOR | SWT.HORIZONTAL)).doFillIntoGrid(composite, nColumns, convertHeightInCharsToPixels(1));		
	}
	/**
	 * Creates the controls for the package name field. Expects a <code>GridLayout</code> with at 
	 * least 4 columns.
	 * 
	 * @param composite the parent composite
	 * @param nColumns number of columns to span