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
fEnclosingTypeDialogField= new StringButtonDialogField(adapter);
		fEnclosingTypeDialogField.setDialogFieldListener(adapter);
		fEnclosingTypeDialogField.setButtonLabel(NewWizardMessages.getString("NewTypeWizardPage.enclosing.button")); 
		
		fTypeNameDialogField= new StringDialogField();
		fTypeNameDialogField.setDialogFieldListener(adapter);
		fTypeNameDialogField.setLabelText(NewWizardMessages.getString("NewTypeWizardPage.typename.label")); 
		
		fSuperClassDialogField= new StringButtonDialogField(adapter);
		fSuperClassDialogField.setDialogFieldListener(adapter);
		fSuperClassDialogField.setLabelText(NewWizardMessages.getString("NewTypeWizardPage.superclass.label")); 
		fSuperClassDialogField.setButtonLabel(NewWizardMessages.getString("NewTypeWizardPage.superclass.button")); 
		
		String[] addButtons= new String[] {
			 NewWizardMessages.getString("NewTypeWizardPage.interfaces.add"), 
			 null,
			 NewWizardMessages.getString("NewTypeWizardPage.interfaces.remove") 
		}; 
		fSuperInterfacesDialogField= new ListDialogField(adapter, addButtons, new InterfacesListLabelProvider());
		fSuperInterfacesDialogField.setDialogFieldListener(adapter);
		String interfaceLabel= fIsClass ? NewWizardMessages.getString("NewTypeWizardPage.interfaces.class.label") : NewWizardMessages.getString("NewTypeWizardPage.interfaces.ifc.label"); 
		fSuperInterfacesDialogField.setLabelText(interfaceLabel);
		fSuperInterfacesDialogField.setRemoveButtonIndex(2);
	
		String[] buttonNames1= new String[] {
			 NewWizardMessages.getString("NewTypeWizardPage.modifiers.public"), 
			 NewWizardMessages.getString("NewTypeWizardPage.modifiers.default"), 
			 NewWizardMessages.getString("NewTypeWizardPage.modifiers.private"), 
			 NewWizardMessages.getString("NewTypeWizardPage.modifiers.protected")