Show the X compose sequence for a character, if one exists
If I use a character often, I don't want to have to go copy-and-paste it each time. Accented characters and odd symbols can usually be typed using a compose sequence. It would be extremely useful if gucharmap showed the compose sequence, e.g.
<compose> <C> <equal> to type a euro symbol, along with the other character information that it already displays. (There are often several available compose sequences — maybe it should display them all, or try to intelligently choose the easiest for the user's current keyboard? But even displaying any one of them would be immensely useful.)
Since compose sequences depend on the user's configuration, they should be queried dynamically, based on the X11 Compose machinery.