We now correctly recognise ‘guix -Abcdef’ as equivalent to ‘guix -f’.
* etc/completion/bash/guix (_guix_is_short_option, guix_is_long_option):
New functions.
(_guix_is_dash_f, _guix_is_dash_l, _guix_is_dash_L, _guix_is_dash_m)
(_guix_is_dash_C, _guix_is_dash_p): Use them.
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