Bug 25845 Support for manually attaching source to a class path container
From Dejan: There is a work item on the ability to manually attach source to classpath entries managed by classpath container. We discussed it and we have workable options but we would like if we can have it by M3 because we want to start self-hosting using classpath containers ourselves.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
title= NewWizardMessages.getString("LibrariesWorkbookPage.ContainerDialog.new.title"); 
		} else {
			title= NewWizardMessages.getString("LibrariesWorkbookPage.ContainerDialog.edit.title"); 
			elem= existing.getClasspathEntry();
		}
		return openContainerDialog(title, new ClasspathContainerWizard(elem, fCurrJProject, getRawClasspath()));
	}
	
	private CPListElement[] openContainerDialog(String title, ClasspathContainerWizard wizard) {
		WizardDialog dialog= new WizardDialog(getShell(), wizard);
		PixelConverter converter= new PixelConverter(getShell());
		
		dialog.setMinimumPageSize(converter.convertWidthInCharsToPixels(40), converter.convertHeightInCharsToPixels(20));
		dialog.create();
		dialog.getShell().setText(title);
		if (dialog.open() == WizardDialog.OK) {
			IClasspathEntry created= wizard.getNewEntry();
			if (created != null) {			
				CPListElement elem= new CPListElement(fCurrJProject, IClasspathEntry.CPE_CONTAINER, created.getPath(), null);
				if (elem != null) {
					return new CPListElement[] { elem };
				}
			}
		}			
		return null;
	}	
	
	
	private void addAttachmentsFromExistingLibs(CPListElement elem) {
		if (elem.getEntryKind() == IClasspathEntry.CPE_CONTAINER) {