[account42]

> The result of a compose sequence is limited to a single "key symbol", which can only encode a single unicode codepoint.

Not true even if some broken toolkits impose that limitation.

[Zirias]

Thanks for the pointer, this made me have another closer look at xkbcommon's API. Probably not too relevent for the tool I'm currently writing, but I'll keep that in mind: Instead of a key symbol, you can also obtain an utf-8 encoded string. Nice.

Still, in practice, it will only work with some applications...