bug#40273: installer: No way to input Latin characters with non-Latin keyboard layouts

[Mathieu Othacehe]

Hey,

> * Guile-newt functions "newt-set-help-callback" and
>   "add-component-callback" seem to be tripping over each other and I'm
>   having a hard time trying to understand why.

Ok I found out why, it was the GC that was collecting the callback
pointers. I fixed it in Guile-newt.

Now I pushed a 'wip-installer-help' branch that implement this
mechanism. I'm now able to switch the installer keyboard layout from any
step.

WDYT?

Mathieu