Bug 9159 Classpath wizard should not complain when adding missing source folder
Build 20020125 - Define a project A with source folder 'src1'. - Go to the .classpath file and edit it to insert one extra line: <classpathentry kind="src" path="src2"/> below the line referring to first source folder: <classpathentry kind="src" path="src1"/>. - Now, try to add this missing source folder 'src2', it isn't allowed by the wizard, one has to add a basic folder instead. Note: It is not such an uncommon scenario, the classpath modification could simply occur by catching up with a shared classpath having one more source folder on it, and which is locally missing.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/CPListLabelProvider.java
private String fNewLabel, fClassLabel;
	private Image fJarIcon, fExtJarIcon, fJarWSrcIcon, fExtJarWSrcIcon;
	private Image fFolderImage, fProjectImage, fVariableImage;
	private Image fMissingLibaryImage, fMissingVariableImage;
	private Image fMissingFolderImage, fMissingProjectImage;
	
	public CPListLabelProvider() {
		fNewLabel= NewWizardMessages.getString("CPListLabelProvider.new"); 
		fClassLabel= NewWizardMessages.getString("CPListLabelProvider.classcontainer"); 
		ImageRegistry reg= JavaPlugin.getDefault().getImageRegistry();
		
		fJarIcon= reg.get(JavaPluginImages.IMG_OBJS_JAR);
		fExtJarIcon= reg.get(JavaPluginImages.IMG_OBJS_EXTJAR);
		fJarWSrcIcon= reg.get(JavaPluginImages.IMG_OBJS_JAR_WSRC);
		fExtJarWSrcIcon= reg.get(JavaPluginImages.IMG_OBJS_EXTJAR_WSRC);
		fFolderImage= reg.get(JavaPluginImages.IMG_OBJS_PACKFRAG_ROOT);