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
Object rootObject,
			ITreeContentProvider treeContentProvider,
			ILabelProvider treeLabelProvider,
			IStructuredContentProvider listContentProvider,
			ILabelProvider listLabelProvider,
			int style,
			int width,
			int height) {
		fRoot= rootObject;
		fTreeContentProvider= treeContentProvider;
		fListContentProvider= listContentProvider;
		fTreeLabelProvider= treeLabelProvider;
		fListLabelProvider= listLabelProvider;
		createContents(parent, width, height, style);
	}
	/**
	 * This method must be called just before this window becomes visible.
	 */
	public void aboutToOpen() {
		determineWhiteCheckedDescendents(fRoot);
		checkNewTreeElements(getTreeChildren(fRoot));
		fCurrentTreeSelection= null;
		
		Object[] elements= getTreeChildren(fRoot);
		Object primary= elements.length > 0 ? elements[0] : null;
		if (primary != null) {
			fTreeViewer.setSelection(new StructuredSelection(primary));
		}
		fTreeViewer.getControl().setFocus();
	}