Bug 73984 Editing user library jar path after path change does not work [build path]
1) Create a directory containing jar file 2) Add this jar file to a new user library 3) Rename directory from 1) 4) Update the path to jar file in user libraries (select old jar reference, select new location in browser, open -> path is not updated, but old path is still used
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/UserLibraryPreferencePage.java
private static final String CURRENT_VERSION= "1"; 
		private static final String TAG_ROOT= "eclipse-userlibraries"; 
		private static final String TAG_VERSION= "version"; 
		private static final String TAG_LIBRARY= "library"; 
		private static final String TAG_SOURCEATTACHMENT= "source"; 
		private static final String TAG_ARCHIVE_PATH= "path"; 
		private static final String TAG_ARCHIVE= "archive"; 
		private static final String TAG_SYSTEMLIBRARY= "systemlibrary"; 
		private static final String TAG_NAME= "name"; 
		private static final String TAG_JAVADOC= "javadoc"; 
		private static final String PREF_LASTPATH= JavaUI.ID_PLUGIN + ".lastuserlibrary"; 
		private static final String PREF_USER_LIBRARY_LOADSAVE_SIZE= "UserLibraryLoadSaveDialog.size"; 
		
		private List fExistingLibraries;
		private IDialogSettings fSettings;
		
		private File fLastFile;
		
		private StringButtonDialogField fLocationField;
		private CheckedListDialogField fExportImportList;
		private Point fInitialSize;
		private final boolean fIsSave;