Bug 29170 False error feedback from "Show in package explorer"
Build 20030107 1. Open a .java file in the Java editor. 2. Click "Collapse All" in the packages view to collapse the tree. 3. Right click on the top-level type in the Outline view and choose "Show in Package Explorer" 4. The packages view correctly expands to the selected type, but an error dialog pops up: Title: "Show in Package Explorer" Message: "Couldn't reveal the selected element in Package Explorer. May be the element is filtered out." This happens any time the tree needs to be expanded to reveal a type.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
} else
						list.add(object);
				}
				return list.toArray();
			}
			
			
			private Object filter(Object object, Object parent, ViewerFilter[] filters) {
				for (int i = 0; i < filters.length; i++) {
					ViewerFilter filter = filters[i];
					if (!filter.select(fViewer, parent, object))
						return null;
				}
				return object;
			}
		
			/* Checks if a filtered object in essential (ie. is a parent that
			 * should not be removed).
			 */ 
			private boolean isEssential(Object object) {
				try {
					if (!isFlatLayout() && object instanceof IPackageFragment) {
						IPackageFragment fragment = (IPackageFragment) object;
						return !fragment.isDefaultPackage() && fragment.hasSubpackages();
					}
				} catch (JavaModelException e) {
					JavaPlugin.log(e);
				}
				return false;
			}