/usr/share/fish/completions/evince.fish is in fish-common 2.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | complete -c evince -a '(__fish_complete_file_url)'
complete -c evince -s p -l page-label -d "The page of the document to display" -x
complete -c evince -s f -l fullscreen -d "Run evince in fullscreen mode"
complete -c evince -s s -l presentation -d "Run evince in presentation mode"
complete -c evince -s w -l preview -d "Run evince as a previewer"
complete -c evince -l display -d "X display to use"
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