Shows recent clipboard items, allowing you to switch between them to re-copy previous values.
Clicking the icon button opens the popup containing all functionality.
Supports plain text and images.

| `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. |