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
elementsToAdd.add(srcentries[i]);
						}
					}						
				} else {
					CPListElement entry= openNewSourceContainerDialog(null);
					if (entry != null) {
						elementsToAdd.add(entry);
					}
				}
				if (!elementsToAdd.isEmpty()) {
					if (fFoldersList.getSize() == 1) {
						CPListElement existing= (CPListElement) fFoldersList.getElement(0);
						if (existing.getResource() instanceof IProject) {
							askForChangingBuildPathDialog(existing);
						}
					}
					HashSet modifiedElements= new HashSet();
					askForAddingExclusionPatternsDialog(elementsToAdd, modifiedElements);
					
					fFoldersList.addElements(elementsToAdd);
					fFoldersList.postSetSelection(new StructuredSelection(elementsToAdd));
					
					if (!modifiedElements.isEmpty()) {
						for (Iterator iter= modifiedElements.iterator(); iter.hasNext();) {
							Object elem= iter.next();
							fFoldersList.refresh(elem);
							fFoldersList.expandElement(elem, 3);
						}
					}
				}