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
String errorTitle= PreferencesMessages.getString("UserLibraryPreferencePage.LoadSaveDialog.save.errordialog.title"); 
					String errorMessage= PreferencesMessages.getFormattedString("UserLibraryPreferencePage.LoadSaveDialog.save.errordialog.message", e.getMessage()); 
					ExceptionHandler.handle(e, getShell(), errorTitle, errorMessage);
				} catch (InterruptedException e) {
					
					return;
				}
			}
			super.okPressed();
		}
		
		/* (non-Javadoc)
		 * @see org.eclipse.jface.dialogs.Dialog#close()
		 */
		public boolean close() {
			Point point= getShell().getSize();
			fSettings.put(PREF_USER_LIBRARY_LOADSAVE_SIZE, StringConverter.asString(point));
			return super.close();
		}
		
		private IStatus validateSettings() {
			String name= fLocationField.getText();
			fLastFile= null;
			if (isSave()) {
				if (name.length() == 0) {
					return new StatusInfo(IStatus.ERROR, PreferencesMessages.getString("UserLibraryPreferencePage.LoadSaveDialog.location.error.save.enterlocation")); 
				}
				File file= new File(name);
				if (file.isDirectory()) {
					return new StatusInfo(IStatus.ERROR, PreferencesMessages.getString("UserLibraryPreferencePage.LoadSaveDialog.location.error.save.invalid"));