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.

[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.

[jeremypw]

Need to find a solution that works on Wayland.

[jeremypw]

@Marukesu I think a dependency on gdk-wayland-3.0 may be required to make it work under Wayland. This should not be necessary under Gtk4, so maybe better to wait for the Gtk4 port to land to fix Wayland? If so, maybe this can be merged so that it at least works on OS7.1 and in "Compatability Mode".

[Marukesu]

I think it should be fine for what the notification sever can do right now.

We really need to have the Gtk Notification interface implemented there to have the true timestamp of the event, but that can be done later.