Bug 55884 Loading a user library from file does not warn when overwriting an existing library [build path]
Works in I2004032400010 + plug-in export for I200403240800 Add library 'mylib'. Save it. Change it. Load library from file. ==> should warn that 'mylib' gets changed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/UserLibraryPreferencePage.java
}
		}
	
		/* (non-Javadoc)
		 * @see org.eclipse.jface.dialogs.Dialog#okPressed()
		 */
		protected void okPressed() {
			if (isSave()) {
				final File file= new File(fLocationField.getText());
				if (file.exists()) {
					String title= PreferencesMessages.getString("UserLibraryPreferencePage.LoadSaveDialog.overwrite.title"); 
					String message= PreferencesMessages.getString("UserLibraryPreferencePage.LoadSaveDialog.overwrite.message"); 
					if (!MessageDialog.openQuestion(getShell(), title, message)) {
						return;
					}
				}
				final List elements= fExportImportList.getCheckedElements();
				IRunnableContext context= PlatformUI.getWorkbench().getProgressService();
				try {
					context.run(true, true, new IRunnableWithProgress() {
						public void run(IProgressMonitor monitor) throws InvocationTargetException, InterruptedException {
							try {
								saveLibraries(elements, file, monitor);
							} catch (IOException e) {
								throw new InvocationTargetException(e);
							}
						}
					});
					fSettings.put(PREF_LASTPATH, file.getPath());
				} catch (InvocationTargetException e) {