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
return;
		}
		
		try {
			IJavaModel jmodel= fCurrJProject.getJavaModel();
			IJavaProject[] jprojects= jmodel.getJavaProjects();
			for (int i= 0; i < jprojects.length; i++) {
				IJavaProject curr= jprojects[i];
				if (!curr.equals(fCurrJProject)) {
					IClasspathEntry[] entries= curr.getRawClasspath();
					for (int k= 0; k < entries.length; k++) {
						IClasspathEntry entry= entries[k];
						if (entry.getEntryKind() == elem.getEntryKind()
							&& entry.getPath().equals(elem.getPath())) {
							IPath attachPath= entry.getSourceAttachmentPath();
							if (attachPath != null && !attachPath.isEmpty()) {
								elem.setAttribute(CPListElement.SOURCEATTACHMENT, attachPath);
								return;
							}
						}
					}
				}
			}
			elem.setAttribute(CPListElement.JAVADOC, JavaUI.getLibraryJavadocLocation(elem.getPath()));
		} catch (JavaModelException e) {
			JavaPlugin.log(e.getStatus());
		}
	}
	
	private class AdvancedDialog extends Dialog {