The fish shell has added a flag to the abbr command which allows one to expand it only if it is typed after a real command e.g.:
git s -> git status
s -> s
Also see the last example here: https://fishshell.com/docs/current/cmds/abbr.html#examples
Commit 8cedd6 `fish: support flexible abbreviations` removed shell
escaping for fish shell abbr values. This was a dangerous breaking
change offered little value and made writing abbr expansions more
difficult. This commit restores automatic shell escaping of fish abbr
values.
