Show current copied content on top panel

[motmaytinh]

Is your feature request related to a problem? Please describe. I don't remember what text, url or photo that I currently copy.

Describe the solution you'd like It would be nice to show some first characters of the text being copied.

Describe alternatives you've considered Open up pano to see the first item.

Additional context

[oae]

Duplicate of https://github.com/oae/gnome-shell-pano/issues/110