Fix stashes display

Changing directories while checking for untracked files broke
the display of git stashes. The hook was not called any more.
This is why we disabled checking for untracked files within a
.git folder.

functions/vcs.zsh

@@ -8,35 +8,19 @@
 
 set_default POWERLEVEL9K_VCS_SHOW_SUBMODULE_DIRTY false
 function +vi-git-untracked() {
-    [[ -z "${vcs_comm[gitdir]}" ]] && return
-
-    # If we are in a repos root folder, vcs_comm[gitdir] yields ".git".
-    # Inside the .git dir itself (and not a subdir of it) the variable
-    # yields ".". In any other case (either a subdirectory of .git or
-    # the repo itself), the value of vcs_comm[gitdir] is the absolute
-    # path to the .git directory.
-    # Therefore we can step up a directory, if we are inside the .git
-    # folder. And in any other case, use the parent directory of the
-    # gitdir.
-    local repoDir="."
-    # Getting the parent dir of the current dir "." is still ".", so
-    # is is safe to do this always.
-    [[ "${vcs_comm[gitdir]}" != ".git" ]] && repoDir="${vcs_comm[gitdir]:h}"
-    [[ "${vcs_comm[gitdir]}" == "." ]] && repoDir=".."
-
-    if [[ "$POWERLEVEL9K_VCS_SHOW_SUBMODULE_DIRTY" == "true" && "$(cd ${repoDir} && command git submodule foreach --quiet --recursive 'command git ls-files --others --exclude-standard')" != "" ]]; then
+    [[ -z "${vcs_comm[gitdir]}" || "${vcs_comm[gitdir]}" == "." ]] && return
+    # If we are in a .git folder, do not check for untracked files.
+    [[ "${PWD:A}" =~ "\.git/" ]] && return
+
+    if [[ "$POWERLEVEL9K_VCS_SHOW_SUBMODULE_DIRTY" == "true" && "$(command git submodule foreach --quiet --recursive 'command git ls-files --others --exclude-standard')" != "" ]]; then
         hook_com[unstaged]+=" $(print_icon 'VCS_UNTRACKED_ICON')"
         VCS_WORKDIR_HALF_DIRTY=true
-    elif [[ "$(cd ${repoDir} && command git ls-files --others --exclude-standard)" != "" ]]; then
+    elif [[ "$(command git ls-files --others --exclude-standard)" != "" ]]; then
         hook_com[unstaged]+=" $(print_icon 'VCS_UNTRACKED_ICON')"
         VCS_WORKDIR_HALF_DIRTY=true
     else
         VCS_WORKDIR_HALF_DIRTY=false
     fi
-
-    # If we are in any other directory than the repo root, we want
-    # to go back a directory.
-    [[ "${vcs_comm[gitdir]}" != ".git" ]] && cd - >/dev/null
 }
 
 function +vi-git-aheadbehind() {