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
if (elementToEdit != null) {
				fNameField.setText(elementToEdit.getName());
				fIsSystemField.setSelection(elementToEdit.isSystemLibrary());
			} else {
				fNameField.setText(""); 
				fIsSystemField.setSelection(false);
			}
		}
		
		/* (non-Javadoc)
		 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
		 */
		protected Control createDialogArea(Composite parent) {
			Composite composite= (Composite) super.createDialogArea(parent);
			LayoutUtil.doDefaultLayout(composite, new DialogField[] { fNameField, fIsSystemField }, true, SWT.DEFAULT, SWT.DEFAULT);
			fNameField.postSetFocusOnDialogField(parent.getDisplay());
			
			Dialog.applyDialogFont(composite);
			return composite;
		}
		
		/* (non-Javadoc)
		 * @see org.eclipse.jdt.internal.ui.wizards.dialogfields.IDialogFieldListener#dialogFieldChanged(org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField)
		 */
		public void dialogFieldChanged(DialogField field) {
			if (field == fNameField) {
				updateStatus(validateSettings());
			}
		}