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
int indent= 0;
			String lineDelimiter= null;	
			if (!isInnerClass) {
				lineDelimiter= System.getProperty("line.separator", "\n"); 
										
				ICompilationUnit parentCU= pack.createCompilationUnit(clName + ".java", "", false, new SubProgressMonitor(monitor, 2)); 
				
				createdWorkingCopy= parentCU.getWorkingCopy(null);
				
				
				String content= CodeGeneration.getCompilationUnitContent(createdWorkingCopy, null, "", lineDelimiter); 
				if (content != null) {
					createdWorkingCopy.getBuffer().setContents(content);
				}
							
				imports= new ImportsManager(createdWorkingCopy);
				
				imports.addImport(JavaModelUtil.concatenateName(pack.getElementName(), getTypeName()));
				
				String typeContent= constructTypeStub(imports, lineDelimiter);
				
				String cuContent= constructCUContent(parentCU, typeContent, lineDelimiter);
				
				createdWorkingCopy.getBuffer().setContents(cuContent);
				
				createdType= createdWorkingCopy.getType(clName);
			} else {
				IType enclosingType= getEnclosingType();
					
				ICompilationUnit parentCU= enclosingType.getCompilationUnit();