Bug 125327 [Dialogs] Error message shown in the InputDialog is not fully visible
When an error message returned by InputValidator is long, InputDialog displays it partially. My suggestion is to create error label with SWT.WRAP flag, or something like this.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/InputDialog.java
*/
    private IInputValidator validator;
    /**
     * Ok button widget.
     */
    private Button okButton;
    /**
     * Input text widget.
     */
    private Text text;
    /**
     * Error message label widget.
     */
    private Text errorMessageText;
    
    /**
     * Error message string.
     */
    private String errorMessage;
    /**
     * Creates an input dialog with OK and Cancel buttons. Note that the dialog
     * will have no visual representation (no widgets) until it is told to open.
     * <p>
     * Note that the <code>open</code> method blocks for input dialogs.
     * </p>
     * 
     * @param parentShell
     *            the parent shell, or <code>null</code> to create a top-level
     *            shell
     * @param dialogTitle