bug#74236: emacs-guix: guix-command-popup not displaying argument improvers

[Christopher Howard]

Note that to even display the guix-command-popup, you have to either set 
guix-repl-use-server to nil, or apply the patch from bug#73462.

The magit popup code for the guix-command-popup (M-x guix c) appears to be 
broken so that it skips the popup menu where you would construct your command 
line argument. Instead, it assumes an empty argument, and jumps to the popup 
where you select whether you want to run the command in the REPL or from a 
shell.

This code is in guix-command.el, and uses the old magit-popup interface (now 
superceded by transient). Presumably either something has changed in 
magit-popup since the code was written (2015-2020) or some Emacs change has 
broken guix-command.el. I hope to investigate this further. My hope is that 
some minor fix can be made to guix-command.el rather than having to rewrite 
everything for transient.

One part I am fuzzy on is how to debug it as it is apparently not possible to 
run edebug-instrument-function on guix-command-popup, as guix-command-popup is 
a function generated by other code. If anybody has any advice concerning this, 
that would be helpful.

Testing this on GNU Emacs 30.0.92 (build 2, x86_64-pc-linux-gnu, GTK+ Version 
3.24.41, cairo version 1.18.0) of 2024-10-29.

-- 
📛 Christopher Howard
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