Displays the title and/or icon of the currently focused window.

| `show_icon` | `boolean` | `true` | Whether to show the app's icon |
| `show_title` | `boolean` | `true` | Whether to show the app's title |
| `icon_size` | `integer` | `32` | Size of icon in pixels |
| `truncate` | `start` or `middle` or `end` or `Map` | `null` | The location of the ellipses and where to truncate text from. Leave null to avoid truncating. Use the long-hand `Map` version if specifying a length. |
| `truncate.mode` | `start` or `middle` or `end` | `null` | The location of the ellipses and where to truncate text from. Leave null to avoid truncating. |
| `truncate.length` | `integer` | `null` | The fixed width (in chars) of the widget. Leave blank to let GTK automatically handle. |
| `truncate.max_length` | `integer` | `null` | The maximum number of characters before truncating. Leave blank to let GTK automatically handle. |