I have noticed Emacs does not produce the desired key unsing the compose key input method when the sequence defining the key to be input is only a single character. The desired key is inserted everywhere else: browser, terminal, gedit, GVim, etc. Composition of two characters—such as
<Multi_key> <g> <a> : "α"—does work in Emacs. (I use Arch Linux and in the example I used the syntax of the .XCompose file).
I've tested setting
.XCompose as simply:
include "%L" <Multi_key> <k> : "^" <Multi_key> <Multi_key> :"^"
The first line does not work on emacs. The second does. I am at loss as to why this happens and I would very much like to dedicate a few letters (giving up on the numerous combinations started by them) to make insertion of certain useful symbols more confortable.