Bug 20446 cannot create protected or private interfaces [code manipulation]
F3 the spec allows creating protected or private nested interfaces but eclipse disallows it (the new interface wizard)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java
createdType= enclosingType.createType(content.toString(), sibling, false, new SubProgressMonitor(monitor, 1));
			
				indent= StubUtility.getIndentUsed(enclosingType) + 1;
			}
			
			
			ICompilationUnit cu= createdType.getCompilationUnit();	
			boolean needsSave= !cu.isWorkingCopy();
			imports.create(needsSave, new SubProgressMonitor(monitor, 1));
	
			JavaModelUtil.reconcile(cu);
		
			createTypeMembers(createdType, imports, new SubProgressMonitor(monitor, 1));
	
			
			imports.create(needsSave, new SubProgressMonitor(monitor, 1));
			
			if (removeUnused(cu, imports)) {
				imports.create(needsSave, null);
			}
			
			JavaModelUtil.reconcile(cu);
			
			ISourceRange range= createdType.getSourceRange();
			
			IBuffer buf= cu.getBuffer();
			String originalContent= buf.getText(range.getOffset(), range.getLength());
			
			String formattedContent= CodeFormatterUtil.format(CodeFormatter.K_CLASS_BODY_DECLARATIONS, originalContent, indent, null, lineDelimiter, pack.getJavaProject());