Bug 6238 jar packager: ide freezes on page flip, no progress shown
i selected org.eclipse.jdt.ui org.eclipse.jdt.ui.tests.refactoring (couple thousands of files) and opened the jar packager or flipping the page the whole ide froze. and there was no progress report shown. it took more or less 2 minutes - of total freeze - to flip to the other wizard page. i suggest performing it in another thread and showing progress
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/CheckboxTreeAndListGroup.java
*	as well as to all of its children and associated list elements
	 */
	public void initialCheckTreeItem(Object element) {
		treeItemChecked(element, true);
	}
	/**
	 *	Initializes this group's viewers after they have been laid out.
	 */
	protected void initialize() {
		fTreeViewer.setInput(fRoot);
	}
	/**
	 *	Callback that's invoked when the checked status of an item in the list
	 *	is changed by the user. Do not try and update the hierarchy if we are building the
	 *  initial list.
	 */
	protected void listItemChecked(
		Object listElement,
		boolean state,
		boolean updatingFromSelection) {
		List checkedListItems= (List) fCheckedStateStore.get(fCurrentTreeSelection);
		if (state) {
			if (checkedListItems == null) {
				
				
				grayCheckHierarchy(fCurrentTreeSelection);
				checkedListItems= (List) fCheckedStateStore.get(fCurrentTreeSelection);
			}
			checkedListItems.add(listElement);
		} else {