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Autojump is repeatedly added to $PATH on repeated sourcing in Fish

Open Administrator requested to merge github/fork/ashwin/master into master

Created by: ashwin

Autojump path is repeatedly added to $PATH on repeated sourcing in Fish shell:

$ echo $PATH
/home/joe/.autojump/bin /home/joe/bin /usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin
$ source ~/.config/fish/config.fish
$ echo $PATH
/home/joe/.autojump/bin /home/joe/.autojump/bin /home/joe/bin /usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin

Sourcing is a common operation in Fish shell to update the current shell after making changes to ~/.config/fish/config.fish

This commit prevents the repeated addition of Autojump path by checking if it is already in $PATH.