Gtk.ToggleButton.prototype.set_inconsistent

function set_inconsistent(setting:Boolean):void {
    // Gjs wrapper for gtk_toggle_button_set_inconsistent()
}

If the user has selected a range of elements (such as some text or spreadsheet cells) that are affected by a toggle button, and the current values in that range are inconsistent, you may want to display the toggle in an "in between" state. This function turns on "in between" display. Normally you would turn off the inconsistent state again if the user toggles the toggle button. This has to be done manually, Gtk.ToggleButton.prototype.set_inconsistent only affects visual appearance, it doesn't affect the semantics of the button.