Appends a custom item to the list of applications that is shown in the popup.
The item name must be unique per-widget. Clients can use the provided name as a detail for the [[email protected]:
GtkAppChooserButton:custom-item-activated] signal, to add a callback for the activation of a particular custom item in the list.
See also [[email protected]_separator].
| this |
a `GtkAppChooserButton` |
| name |
the name of the custom item |
| label |
the label for the custom item |
| icon |
the icon for the custom item |