completion: update completion arguments for stash

Add --all and --include-untracked to the git stash save completions.
Add --quiet to the git stash drop completions.
Update git stash branch so that the first argument expands out to the
possible branch names, and the other arguments expand to the stash
names.

Signed-off-by: Paul Wagland <paul@kungfoocoder.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -2381,7 +2381,7 @@ _git_show_branch ()
 
 _git_stash ()
 {
-	local save_opts='--keep-index --no-keep-index --quiet --patch'
+	local save_opts='--all --keep-index --no-keep-index --quiet --patch --include-untracked'
 	local subcommands='save list show apply clear drop pop create branch'
 	local subcommand="$(__git_find_on_cmdline "$subcommands")"
 	if [ -z "$subcommand" ]; then
@@ -2403,9 +2403,20 @@ _git_stash ()
 		apply,--*|pop,--*)
 			__gitcomp "--index --quiet"
 			;;
-		show,--*|drop,--*|branch,--*)
+		drop,--*)
+			__gitcomp "--quiet"
 			;;
-		show,*|apply,*|drop,*|pop,*|branch,*)
+		show,--*|branch,--*)
+			;;
+		branch,*)
+		  if [ $cword -eq 3 ]; then
+			__gitcomp_nl "$(__git_refs)";
+			else
+				__gitcomp_nl "$(git --git-dir="$(__gitdir)" stash list \
+						| sed -n -e 's/:.*//p')"
+			fi
+			;;
+		show,*|apply,*|drop,*|pop,*)
 			__gitcomp_nl "$(git --git-dir="$(__gitdir)" stash list \
 					| sed -n -e 's/:.*//p')"
 			;;