Bug 30727 exclusion filters: cannot remove [build path]
20030129 create a jproject and a src folder in it add 2 packages to it a.b and c.d exclude c/d/ from the classpath open the java build path dialog, select the source folders expand the tree node select 'Exclusion filter: /c/d/' press 'Remove' seems to be removed, right? wrong. open the dialog again - the filter for /c/d is still there
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
boolean useFolderOutputs= false;
		List cpelements= fClassPathList.getElements();
		for (int i= 0; i < cpelements.size(); i++) {
			CPListElement cpe= (CPListElement)cpelements.get(i);
			if (cpe.getEntryKind() == IClasspathEntry.CPE_SOURCE) {
				folders.add(cpe);
				boolean hasOutputFolder= (cpe.getAttribute(CPListElement.OUTPUT) != null);
				if (hasOutputFolder) {
					useFolderOutputs= true;
				}
			}
		}
		fFoldersList.setElements(folders);
		fUseFolderOutputs.setSelection(useFolderOutputs);
		
		for (int i= 0; i < folders.size(); i++) {
			CPListElement cpe= (CPListElement) folders.get(i);
			IPath[] patterns= (IPath[]) cpe.getAttribute(CPListElement.EXCLUSION);
			boolean hasOutputFolder= (cpe.getAttribute(CPListElement.OUTPUT) != null);
			if (patterns.length > 0 || hasOutputFolder) {
				fFoldersList.expandElement(cpe, 3);
			}				
		}
	}			
	
	public Control getControl(Composite parent) {
		PixelConverter converter= new PixelConverter(parent);
		Composite composite= new Composite(parent, SWT.NONE);