Bug 305375 [ui] Many dialogs about unavailable sites
I20100309-0100 I ran a "Check for Updates" immediately after my machine had come out of standby. I don't think the wireless had fully connected yet, and the check for updates failed (fine). However, I got a half dozen nested dialogs about each of the sites that it could not find. They were all stacked on top of one another, and I had to dismiss each one individually. I would expect it to accumulate this into a single dialog rather than one dialog per repository.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentService.java
* 
	 * @see
	 * org.eclipse.ui.internal.navigator.INavigatorContentService#saveState(
	 * org.eclipse.ui.IMemento)
	 */
	public void saveState(IMemento aMemento) {
		synchronized (this) {
			for (Iterator extensionItr = getExtensions().iterator(); extensionItr
					.hasNext();) {
				NavigatorContentExtension element = (NavigatorContentExtension) extensionItr
						.next();
				element.saveState(aMemento);
			}
		}
	}
	public boolean isActive(String anExtensionId) {
		return assistant.isActive(anExtensionId);
	}
	public boolean isVisible(String anExtensionId) {
		return assistant.isVisible(anExtensionId);
	}
	protected final Collection getExtensions() {
		return (contentExtensions.size() > 0) ? Collections
				.unmodifiableCollection(contentExtensions.values())
				: Collections.EMPTY_LIST;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see