Bug 55090 [Progress] How to show busy in multiple instances of the same view
Currently to get the view busy indicator you have to schedule a job in a workbench part. But what happens when there are multiple instances of a view created, which view should be busy. Ideally, you could instead associate a view type with a job.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
boolean updateNeeded = updateNeeded(focusResources, resources);
		focusResources = resources;
		updateFilterSelection(resources);
		if (updateNeeded) {
			refresh();
		}
	}
	private boolean updateNeeded(IResource[] oldResources, IResource[] newResources) {
		
		MarkerFilter filter = getFilter();
		if (!filter.isEnabled()) {
			return false;
		}
		
		int onResource = filter.getOnResource();
		if (onResource == MarkerFilter.ON_ANY_RESOURCE || onResource == MarkerFilter.ON_WORKING_SET) {
			return false;
		}
		if (newResources == null || newResources.length < 1) {
			return false;
		}
		if (oldResources == null || oldResources.length < 1) {
			return true;
		}
		if (Arrays.equals(oldResources, newResources)) {
			return false;
		}
		if (onResource == MarkerFilter.ON_ANY_RESOURCE_OF_SAME_PROJECT) {
			Collection oldProjects = MarkerFilter.getProjectsAsCollection(oldResources);
			Collection newProjects = MarkerFilter.getProjectsAsCollection(newResources);