Entering unicode with Ctrl-Shift-U: underlined 'u' and input not displayed
When entering unicode characters by pressing Ctrl-Shift-U the expected behaviour is, that an underlined 'u' and the following input will be displayed and after pressing Return the unicode-character will appear.
Using i3 I am still able to enter unicode-characters in the described way, however the underlined 'u' and the input code is not displayed. When using Gnome on the same system (Fedora 19) everything works fine.
Sometimes I would very much prefer to see what I am typing, so my question is, if anyone has experienced this behaviour and has a solution for it or at least can give me some directions where and what to look for.