Incorrect handling of symlinks to subdirectory of git repo

[pvsr]

ln -s ~/dev/fish-prompt-pvsr/functions ~/functions; cd ~/functions results in an entirely incorrect prompt path of ~/f/username, with the username segment highlighted as the vcs root. Even worse, mkdir ~/functions/sub; cd ~/functions/sub gives the exact same prompt. The correct prompt paths are ~/functions and ~/f/sub respectively, with vcs info but no highlighted root.

If the symlink is not directly under ~ then only the vcs root highlighting is wrong. mv ~/functions ~/dev; cd ~/dev/functions shows ~/dev/functions with dev highlighted as the root, but it should be ~/d/functions with no highlight.