additional load-change webkit2 events (v3-alpha events)

[Place1]

Is your feature request related to a problem? Please describe.

Hello, I have been testing out the v3-alpha branch locally and the new events system is really nice to use! I was thinking to contribute the addition of the following additional load-change events but I have some follow-on questions:

Describe the solution you'd like

I want to add:

type linuxEvents struct {
	WindowLoadStarted    WindowEventType // new
	WindowLoadRedirected WindowEventType // new
	WindowLoadComitted   WindowEventType // new
	WindowLoadChanged    WindowEventType // Consider renaming to WindowLoadFinished for consistency with webkit?
	// <snip>
}

These are documented here: https://webkitgtk.org/reference/webkit2gtk/2.4.2/WebKitWebView.html#WebKitWebView-load-changed

And then I'd make this change to handleLoadChanged()

func handleLoadChanged(webview *C.WebKitWebView, event C.WebKitLoadEvent, data C.uintptr_t) {
	switch event {
	case C.WEBKIT_LOAD_STARTED:
		// provisional_uri = webkit_web_view_get_uri (web_view);
		processWindowEvent(C.uint(data), C.uint(events.Linux.WindowLoadStarted))
	case C.WEBKIT_LOAD_REDIRECTED:
		// redirected_uri = webkit_web_view_get_uri (web_view);
		processWindowEvent(C.uint(data), C.uint(events.Linux.WindowLoadRedirected))
	case C.WEBKIT_LOAD_COMMITTED:
		// uri = webkit_web_view_get_uri (web_view);
		processWindowEvent(C.uint(data), C.uint(events.Linux.WindowLoadComitted))
	case C.WEBKIT_LOAD_FINISHED:
		processWindowEvent(C.uint(data), C.uint(events.Linux.WindowLoadChanged))
	}
}

Questions:

• How can we pass additional information like the provisional_uri or redirected_uri on the events?
• My ultimate goal is to cancel the WEBKIT_LOAD_STARTED event in my go application.
  • The loading event can be cancelled with C.webkit_web_view_stop_loading(webview).
  • How should this work?

Any guidance would be appreciated :)

Describe alternatives you've considered

Additional context