Change git-info verbose mode implementation

so it behaves alike the non-verbose mode. For example, in the "merge"
special action context, files are being reported as both indexed and
unindexed by `git diff-index` and `git diff-files` commands in
non-verbose mode. That was not the case with the regular expressions
used in the verbose mode.

modules/git-info/README.md

@@ -100,5 +100,5 @@ Second, format how the above attributes are displayed in prompts:
       'rprompt' '[%R]'
 
 Last, add `$git_info[prompt]` to `$PROMPT` and `$git_info[rprompt]` to
-`$RPROMPT` respectively and call `git-info` in the `prompt_name_preexec` hook
+`$RPROMPT` respectively and call `git-info` in the `prompt_name_precmd` hook
 function.

modules/git-info/init.zsh

@@ -258,15 +258,11 @@ git-info() {
     local untracked
     # Get current status.
     while IFS=$'\n' read line; do
-      # T (type change) is undocumented, see http://git.io/FnpMGw.
-      if [[ ${line} == \?\?\ * ]]; then
+      if [[ ${line:0:2} == '??' ]]; then
         (( untracked++ ))
-      elif [[ ${line} == \ [DMT]\ * ]]; then
-        (( unindexed++ ))
-      elif [[ ${line} == [ACDMRT]\ \ * ]]; then
-        (( indexed++ ))
-      elif [[ ${line} == ([ACMRT][DMT]|D[MT])\ * ]]; then
-        (( indexed++, unindexed++ ))
+      else
+        [[ ${line:0:1} != ' ' ]] && (( indexed++ ))
+        [[ ${line:1:1} != ' ' ]] && (( unindexed++ ))
       fi
       (( dirty++ ))
     done < <(${(z)status_cmd} 2>/dev/null)