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
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;
		public LoadSaveDialog(Shell shell, List existingLibraries, IDialogSettings dialogSettings) {
			super(shell);
			setShellStyle(getShellStyle() | SWT.MAX | SWT.RESIZE);
			
			PixelConverter converter= new PixelConverter(shell);
			
			fExistingLibraries= existingLibraries;
			fSettings= dialogSettings;
			fLastFile= null;
			
			int defaultWidth= converter.convertWidthInCharsToPixels(80);
			int defaultHeigth= converter.convertHeightInCharsToPixels(34);
			String lastSize= fSettings.get(PREF_USER_LIBRARY_LOADSAVE_SIZE);
			if (lastSize != null) {
				fInitialSize= StringConverter.asPoint(lastSize, new Point(defaultWidth, defaultHeigth));
			} else {
				fInitialSize= new Point(defaultWidth, defaultHeigth);
			}
		
			if (isSave()) {