[helm] Add helm-ls-git-ls to SPC g f f

The HELM Lsgit buffer has three sections:
- Git status (files: modified, deleted, etc.)
- Buffers in git project
- Git files

CHANGELOG.develop

@@ -1712,6 +1712,8 @@ Other:
   (thanks to cjay, CthulhuDen and Magnus Therning)
 - Included =attrap= when =dante= is used (thanks to Pepe Iborra)
 **** Helm
+- New packages:
+  - =helm-ls-git= (thanks to duianto)
 - Improvements:
   - Load helm before =read-file-name= and =completing-read=
     (thanks duianto and thanks Miciah for a more elegant solution)
@@ -1751,6 +1753,7 @@ Other:
   - Added ~SPC s C~ for =helm-swoop-clear-cache= (thanks to Yang Qian)
   - Removed ~SPC s w w~ key binding for =helm-wikipedia-suggest=, which was
     removed upstream.
+  - ~SPC g f f~ for =helm-ls-git-ls= (thanks to duianto)
 - Fixes
   - Fixed signature of =spacemacs//display-helm-window= (thanks to Jack Kamm)
   - Fixed initialization by calling =helm-mode= when Helm is initialized=

layers/+completion/helm/packages.el

@@ -18,6 +18,7 @@
         helm-ag
         helm-descbinds
         helm-flx
+        (helm-ls-git :require git)
         helm-make
         helm-mode-manager
         helm-projectile
@@ -280,6 +281,11 @@
   (use-package helm-flx
     :defer (spacemacs/defer)))
 
+(defun helm/init-helm-ls-git ()
+  (use-package helm-ls-git
+    :defer t
+    :init (spacemacs/set-leader-keys "gff" 'helm-ls-git-ls)))
+
 (defun helm/init-helm-make ()
   (use-package helm-make
     :defer t