Bug 13620 The Java Source Attachment Preference Page has text with large amount of white space
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/SourceAttachmentPropertyPage.java
new ProgressMonitorDialog(getShell()).run(true, true, runnable);						
			} catch (InvocationTargetException e) {
				String title= JavaUIMessages.getString("SourceAttachmentPropertyPage.error.title"); 
				String message= JavaUIMessages.getString("SourceAttachmentPropertyPage.error.message"); 
				ExceptionHandler.handle(e, getShell(), title, message);
				return false;
			} catch (InterruptedException e) {
				
				return false;
			}				
		}
		return true;
	}
	
	/*
	 * @see PreferencePage#performDefaults()
	 */
	protected void performDefaults() {
		if (fSourceAttachmentBlock != null) {
			fSourceAttachmentBlock.setDefaults();
		}
		super.performDefaults();
	}	
				
	private IPackageFragmentRoot getJARPackageFragmentRoot() {
		
		IAdaptable adaptable= getElement();
		IJavaElement elem= (IJavaElement) adaptable.getAdapter(IJavaElement.class);
		if (elem instanceof IPackageFragmentRoot) {
			IPackageFragmentRoot root= (IPackageFragmentRoot) elem;