helm-projectile-grep fails to respect projectile-use-git-grep variable

[tko]

In a git project setting projectile-use-git-grep significantly increases the performance of projectile-grep but that does not seem to have any effect on helm-projectile-grep.

From: syl20bnr/spacemacs#1835

[yatesco]

I can confirm the same.

I have (setq projectile-use-git-grep 1) in my .emacs.d/personal/personal.el yet when I do C-c p s g it is showing me results from files that are ignored in my .gitignore. If I manually call vc-git-grep for * files and navigate to my project root then I only see results in non-ignored files.

In addition, helm-git-grep works as expected.

(Thanks for projectile and prelude though - they are brill!, little issues like this not-withstanding ;-)).