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/LibrariesWorkbookPage.java
Object elem= selElements.get(0);
		if (fLibrariesList.getIndexOfElement(elem) != -1) {
			editElementEntry((CPListElement) elem);
		} else if (elem instanceof CPListElementAttribute) {
			editAttributeEntry((CPListElementAttribute) elem);
		}
	}
	
	private void editAttributeEntry(CPListElementAttribute elem) {
		String key= elem.getKey();
		if (key.equals(CPListElement.SOURCEATTACHMENT)) {
			CPListElement selElement= (CPListElement) elem.getParent();
			
			IPath containerPath= null;
			boolean applyChanges= false;
			CPListElement parentContainer= selElement.getParentContainer();
			if (parentContainer != null) {
				containerPath= parentContainer.getPath();
				applyChanges= true;
			}
			SourceAttachmentDialog dialog= new SourceAttachmentDialog(getShell(), selElement.getClasspathEntry(), containerPath, fCurrJProject, applyChanges);
			if (dialog.open() == SourceAttachmentDialog.OK) {
				selElement.setAttribute(CPListElement.SOURCEATTACHMENT, dialog.getSourceAttachmentPath());
				fLibrariesList.refresh();
				fClassPathList.refresh(); 
			}
		} else if (key.equals(CPListElement.JAVADOC)) {
			CPListElement selElement= (CPListElement) elem.getParent();
			JavadocPropertyDialog dialog= new JavadocPropertyDialog(getShell(), selElement);
			if (dialog.open() == JavadocPropertyDialog.OK) {