Bug 115832 [build path] Can't uncheck export of source folder
build I20051102-1600 In order to test compiling JFace against a reduced subset of core.runtime, I: - changed the build path of org.eclipse.jface to include its runtime-util source folder - removed the plug-in dependencies classpath container - added o.e.core.commands and SWT as explicit projects On the Libraries tab, the runtime-util source folder is exported, and I cannot uncheck it, even though the check box is enabled. With this setup, downstream plug-ins complain about references to IProgressMonitor etc due to access restrictions from JFace. I do not want these plug-ins to see the ones in runtime-util. They should compile against the org.eclipse.core.runtime plug-in as usual. Expected behaviour: - The ability to uncheck export of the source folder.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
* output location of the existing project 
	 * @param classpathEntries The classpath entries to be set in the page. If <code>null</code>
	 * is passed, jdt default settings are used, or - if the project is an existing Java project - the
	 * classpath entries of the existing project
	 */	
	public void init(IJavaProject jproject, IPath outputLocation, IClasspathEntry[] classpathEntries) {
		fCurrJProject= jproject;
		boolean projectExists= false;
		List newClassPath= null;
		IProject project= fCurrJProject.getProject();
		projectExists= (project.exists() && project.getFile(".classpath").exists()); 
		if  (projectExists) {
			if (outputLocation == null) {
				outputLocation=  fCurrJProject.readOutputLocation();
			}
			if (classpathEntries == null) {
				classpathEntries=  fCurrJProject.readRawClasspath();
			}
		}
		if (outputLocation == null) {
			outputLocation= getDefaultBuildPath(jproject);
		}			
		if (classpathEntries != null) {
			newClassPath= getExistingEntries(classpathEntries);
		}
		if (newClassPath == null) {
			newClassPath= getDefaultClassPath(jproject);
		}
		
		List exportedEntries = new ArrayList();