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
*/
	protected void setWhiteChecked(Object treeElement, boolean isWhiteChecked) {
		if (isWhiteChecked) {
			if (!fWhiteCheckedTreeItems.contains(treeElement))
				fWhiteCheckedTreeItems.add(treeElement);
		} else
			fWhiteCheckedTreeItems.remove(treeElement);
	}
	/**
	 *	Handle the collapsing of an element in a tree viewer
	 */
	public void treeCollapsed(TreeExpansionEvent event) {
		
	}
	/**
	 *	Handles the expansionsion of an element in a tree viewer
	 */
	public void treeExpanded(TreeExpansionEvent event) {
		Object item= event.getElement();
		
		
		if (!fExpandedTreeNodes.contains(item)) {
			fExpandedTreeNodes.add(item);
			checkNewTreeElements(getTreeChildren(item));
		}
	}
	/**
	 *  Callback that's invoked when the checked status of an item in the tree
	 *  is changed by the user.
	 */