Bug 30291 SearchUsagesInFileAction should show dialog in case of failures
Build I20030122 SearchUsagesInFileAction should show a dialog in failure/error cases (e.g. code resolve fails).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/SearchUsagesInFileAction.java
String otherKey= binding.getKey();
			String targetKey= fTarget.getKey();
						
			if (targetKey != null && otherKey != null) {
				if (targetKey.equals(otherKey))
					result.add(node);
			}
		}
		private Name getName(Expression expression) {
			if (expression instanceof SimpleName)
				return ((SimpleName)expression);
			else if (expression instanceof QualifiedName)
				return ((QualifiedName)expression);
			else if (expression instanceof FieldAccess)
				return ((FieldAccess)expression).getName();
			return null;
		}	
	}
	static class SearchGroupByKeyComputer implements IGroupByKeyComputer {
		
		public Object computeGroupByKey(IMarker marker) {
			return marker; 
		}
	}
	
	public static final String SHOWREFERENCES= "ShowReferences"; 
	public static final String IS_WRITEACCESS= "writeAccess"; 
	public static final String IS_VARIABLE= "variable"; 
	private JavaEditor fEditor;
	private IRunnableWithProgress fNullOperation= getNullOperation();