Base dialog for user notification. This dialog is useful for small notifications to the user about an event. It can only be accepted or closed, with the same result. Adds a button with label [i]text[/i] and a custom [i]action[/i] to the dialog and returns the created button. [i]action[/i] will be passed to the [signal custom_action] signal when pressed. If [code]true[/code], [i]right[/i] will place the button to the right of any sibling buttons. Default value: [code]false[/code]. Adds a button with label [i]name[/i] and a cancel action to the dialog and returns the created button. Return the label used for built-in text. Return the OK Button. Registers a [LineEdit] in the dialog. When the enter key is pressed, the dialog will be accepted. If [code]true[/code] the dialog is hidden when accepted. Default value: [code]true[/code]. The text displayed by this dialog. Emitted when the dialog is accepted. Emitted when a custom button is pressed. See [method add_button].