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
public static final String ID= "org.eclipse.jdt.ui.preferences.UserLibraryPreferencePage"; 
	public static class LibraryNameDialog extends StatusDialog implements IDialogFieldListener {
		private StringDialogField fNameField;
		private SelectionButtonDialogField fIsSystemField;
		private CPUserLibraryElement fElementToEdit;
		private List fExistingLibraries;
		public LibraryNameDialog(Shell parent, CPUserLibraryElement elementToEdit, List existingLibraries) {
			super(parent);
			if (elementToEdit == null) { 
				setTitle(PreferencesMessages.getString("UserLibraryPreferencePage.LibraryNameDialog.new.title")); 
			} else {
				setTitle(PreferencesMessages.getString("UserLibraryPreferencePage.LibraryNameDialog.edit.title")); 
			}
			
			fElementToEdit= elementToEdit;
			fExistingLibraries= existingLibraries;
			
			fNameField= new StringDialogField();
			fNameField.setDialogFieldListener(this);
			fNameField.setLabelText(PreferencesMessages.getString("UserLibraryPreferencePage.LibraryNameDialog.name.label")); 
			
			fIsSystemField= new SelectionButtonDialogField(SWT.CHECK);
			fIsSystemField.setLabelText(PreferencesMessages.getString("UserLibraryPreferencePage.LibraryNameDialog.issystem.label"));