/usr/share/fish/completions/lxpanel.fish is in fish-common 2.2.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | complete -c lxpanel -s h -l help -d 'print this help and exit'
complete -c lxpanel -s v -l version -d 'print version and exit'
complete -c lxpanel -s p -l profile -d 'use specified profile' -xa '(find ~/.config/lxpanel/ -maxdepth 1 -mindepth 1 -type d -printf "%f\n")'
complete -c lxpanel -l log -r -d 'set log level 0-5. 0 - none 5 - chatty'
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