Bug 64298 JAR files already in build path still shown when adding JARs.
When adding JARs to the Java build path in 3.0M9, the JAR's that are already added do not get filtered out anymore like with all previous builds (M8 and lower). Instead, the complete list of all available JARs is shown.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
}
	
	private void askForAddingExclusionPatternsDialog(List newEntries) {
		HashSet modified= new HashSet();
		fixNestingConflicts(newEntries, fClassPathList.getElements(), modified);
		if (!modified.isEmpty()) {
			String title= NewWizardMessages.getString("LibrariesWorkbookPage.exclusion_added.title"); 
			String message= NewWizardMessages.getString("LibrariesWorkbookPage.exclusion_added.message"); 
			MessageDialog.openInformation(getShell(), title, message);
		}
	}
	
	protected void libaryPageDoubleClicked(TreeListDialogField field) {
		List selection= fLibrariesList.getSelectedElements();
		if (canEdit(selection)) {
			editEntry();
		}
	}
	protected void libaryPageKeyPressed(TreeListDialogField field, KeyEvent event) {
		if (field == fLibrariesList) {
			if (event.character == SWT.DEL && event.stateMask == 0) {
				List selection= field.getSelectedElements();
				if (canRemove(selection)) {
					removeEntry();
				}
			}
		}	
	}	
	private void removeEntry() {
		List selElements= fLibrariesList.getSelectedElements();