lgi: gdk.Event.triggers_context_menu: bad argument

[Rena <hyperhacker@...>]

Having a strange issue with button events with lgi. When right-clicking a tab in this program I get an error:

./test.lua:34: bad argument #2 to 'triggers_context_menu' (Gdk.Event expected, got userdata)

but there isn't even a second argument?

#!/usr/bin/env lua
lgi = require('lgi')
gtk = lgi.require('Gtk', '3.0')
gdk = lgi.require('Gdk', '3.0')


local window, viewbox

local function add_some_tabs()
    for i = 1, 3 do
        local page = gtk.Label {
            label = "This is page " .. i ..
                "\nWhy not right-click on a tab?"
        }
        page:show_all()

        local label = gtk.EventBox { gtk.Label { label = "Page " .. i }}
        label:show_all()

        viewbox:append_page(page, label)
        viewbox:show_all()

        local widget = viewbox:get_tab_label(page)
        local window = widget:get_window()

        local events = window:get_events()
        events.BUTTON_PRESS_MASK = true
        events.BUTTON_RELEASE_MASK = true
        window:set_events(events)

        widget._on_button_press_event_ = function(widget, event)
            print("on_button_press_event", event)
            --if event:triggers_context_menu() then
            if gdk.Event.triggers_context_menu(event) then
                print("show menu")
            end
        end
    end
end


window = gtk.Window {
    title = "Window",
    type = gtk.WindowType.TOPLEVEL,
    decorated = true, resizable = true,
    width = 400, height = 400,
    _on_destroy_ = function() os.exit(0) end,

    gtk.Box {
        orientation = 'VERTICAL',
        expand = true,
        visible = true,
        gtk.Button {
            label = "Click Me",
            _on_clicked_ = add_some_tabs,
        },
        gtk.Notebook {
        id = 'viewbox',
            expand = true,
            visible = true,
            show_tabs = true,
            show_border = false,
            enable_popup = false,
            scrollable = true,
        },
    }
}

viewbox = window.child.viewbox
window:show_all()
gtk.main()



--
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