[Feature request] Remove deleted tracking branches

[jm4R]

There is a highly wanted feature, which is nit built-in into git itself:
https://stackoverflow.com/questions/7726949/remove-tracking-branches-no-longer-on-remote

This answer in stackoverflow seems legit:

git fetch -p && for branch in $(git for-each-ref --format '%(refname) %(upstream:track)' refs/heads | awk '$2 == "[gone]" {sub("refs/heads/", "", $1); print $1}'); do git branch -D $branch; done

(The accepted answer does something different - it deletes merged branches, not the ones with are tracking but missing on remote).

Can we have such feature built-in to cola?