Bug 23031 Package explorer does not update when input==package [package explorer]
From a java perspective, create a Java project with two packages (say test.package1 and test.package2). Create a couple of classes in both packages. From the package view, select test.package2 and from the context menu, open a new java window on it. Notice you only see the two classes you created in this package. Now go back to the other window, and move a class from test.package1 to test.package2. Go back to the new window, look at the package view and notice it still only displays 2 classes. Selecting refresh from the context menu does nothing. If you close the package view and open it again, then you see 3 classes.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
return true;
			} else
				postAdd(parent, resource);
		}
		
		if ((flags & IResourceDelta.OPEN) != 0) {
			postProjectStateChanged(internalGetParent(parent));
			return true;		
		}
		processResourceDeltas(delta.getAffectedChildren(), resource);
		return false;
	}
	
	void setIsFlatLayout(boolean state) {
		fIsFlatLayout= state;
	}
	/**
	 * Process resource deltas.
	 *
	 * @return true if the parent got refreshed
	 */
	private boolean processResourceDeltas(IResourceDelta[] deltas, Object parent) {
		if (deltas == null)
			return false;
		
		if (deltas.length > 1) {
			
			postRefresh(parent);
			return true;
		}