Focus current tab

[igordsm]

Fix #73

Tested this with multiple terminal windows and tabs. should work without issues.

[jeremypw]

Is it necessary to add another dependency (especially X11 specific)? Is using "get_server_time" essential?

[igordsm]

@jeremypw Unfortunately it seems get_server_time is essential. Apparently present_with_time needs a timestamp to solve focus stealing and the only timestamp I passed to it that worked was this one. Using regular datetime functions did not work and I found an answer in SO that linked to this function.

[Marukesu]

should be using Gtk.get_current_event_time ()

Suggested change

	var ts = Gdk.X11.get_server_time ((Gdk.X11.Window) window.get_window ());
	window.present_with_time (ts);
	window.present_with_time (Gtk.get_current_event_time ());

[igordsm]

@Marukesu Does this work on your end? It doesn't for me. From what I've read, the timestamp that present_with_time receives must be a X11 server timestamp and the only way I was able to get it was using this Gdk.X11 call. I've tried Gdk.CURRENT_TIME and many types of datetime functions returning the current time as well.

I'm not a fan of adding this dependency too, but it was literally the only timestamp that worked for me.

[Marukesu]

Suggested change

	get_last_window ().present_with_time ((uint32) now.to_unix ());
	get_last_window ().present_with_time (Gtk.get_current_event_time ());

[jeremypw]

Might be worth delaying trying to fix this until elementary/notifications#153 is fixed. It should not be necessary to add that extra dependency.