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
status.setWarning(NewWizardMessages.getFormattedString("NewTypeWizardPage.warning.SuperClassIsFinal", sclassName)); 
						return status;
					} else if (!JavaModelUtil.isVisible(type, getPackageFragment())) {
						status.setWarning(NewWizardMessages.getFormattedString("NewTypeWizardPage.warning.SuperClassIsNotVisible", sclassName)); 
						return status;
					}
				}
				fSuperClass= type;
			} catch (JavaModelException e) {
				status.setError(NewWizardMessages.getString("NewTypeWizardPage.error.InvalidSuperClassName")); 
				JavaPlugin.log(e);
			}							
		} else {
			status.setError(""); 
		}
		return status;
		
	}
	
	private IType resolveSuperTypeName(IJavaProject jproject, String sclassName) throws JavaModelException {
		if (!jproject.exists()) {
			return null;
		}
		IType type= null;
		if (isEnclosingTypeSelected()) {
			
			IType enclosingType= getEnclosingType();
			if (enclosingType != null) {
				String[][] res= enclosingType.resolveType(sclassName);
				if (res != null && res.length > 0) {