_comp_command_offset: duplicate results with direxpand

[dseomn]

Describe the bug

With the direxpand bash option on, sudo completion of commands gives duplicate results which prevents ever completing anything.

To reproduce

$ sudo ~/.local/^C  # from typing: sudo ~/.loc<Tab><Ctrl-C>
$ shopt -s direxpand
$ sudo ~/.loc  # then press tab twice
.local/ .local/ 
$ sudo ~/.loc

Also tested with exec and nohup instead of sudo.

Expected behavior

With direxpand on, I think sudo ~/.loc<Tab> should complete to either sudo ~/.local/ or sudo /home/dseomn/.local/ (for my $HOME at least).

Versions (please complete the following information)

• Operating system name/distribution and version: Debian testing
• bash version, echo "$BASH_VERSION": 5.2.37(1)-release
• bash-completion version, (IFS=.; echo "${BASH_COMPLETION_VERSINFO[*]}"): 2.16.0

Additional context

N/A

Debug trace

sudo-completion-bug.txt

[akinomyoga]

This seems to be caused by the behavior of the Bash builtin compgen:

$ shopt -u direxpand
$ compgen -c -o plusdirs "~/.loc"
~/.local
~/.local
$ shopt -s direxpand
$ compgen -c -o plusdirs "~/.loc"
/home/murase/.local
~/.local

[dseomn]

I just realized that I can just turn off direxpand. Apparently I turned it on because of another bug, but that seems to be fixed now, so I'll just turn it off. I'll leave this issue open, since other people might actually want the behavior of direxpand, but turning off direxpand works for me.