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
return null;
		}
		public boolean hasChildren(TreeListDialogField field, Object element) {
			return (element instanceof CPListElement);
		}		
		
		
		public void dialogFieldChanged(DialogField field) {
			sourcePageDialogFieldChanged(field);
		}
	}
	
	protected void sourcePageDoubleClicked(TreeListDialogField field) {
		if (field == fFoldersList) {
			List selection= fFoldersList.getSelectedElements();
			if (canEdit(selection)) {
				editEntry();
			}
		}
	}
	
	
	protected void sourcePageCustomButtonPressed(DialogField field, int index) {
		if (field == fFoldersList) {
			if (index == IDX_ADD) {
				List elementsToAdd= new ArrayList(10);
				if (fCurrJProject.getProject().exists()) {
					CPListElement[] srcentries= openSourceContainerDialog(null);
					if (srcentries != null) {
						for (int i= 0; i < srcentries.length; i++) {