Bug 13799 JAR exporter exports class files from output folder
There was a problem with the output folder not being detected as such.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarFileExportOperation.java
*/
	private boolean saveModifiedResourcesIfUserConfirms(IFile[] dirtyFiles) {
		if (confirmSaveModifiedResources(dirtyFiles))
			return saveModifiedResources(dirtyFiles);
		
		for (int i= 0; i < dirtyFiles.length; i++)
			addError(JarPackagerMessages.getFormattedString("JarFileExportOperation.fileUnsaved", dirtyFiles[i].getFullPath()), null); 
		return false;
	}
	/**
	 * Save all of the editors in the workbench.  
	 * 
	 * @return true if successful.
	 */
	private boolean saveModifiedResources(final IFile[] dirtyFiles) {
		
		Display display= fParentShell.getDisplay();
		if (display == null || display.isDisposed())
			return false;
		
		final boolean[] retVal= new boolean[1];
		Runnable runnable= new Runnable() {
			public void run() {
				IWorkspace workspace= ResourcesPlugin.getWorkspace();
				IWorkspaceDescription description= workspace.getDescription();
				boolean autoBuild= description.isAutoBuilding();
				description.setAutoBuilding(false);
				try {
					workspace.setDescription(description);