built-in stash: handle :(glob) pathspecs again

When passing a list of pathspecs to, say, `git add`, we need to be
careful to use the original form, not the parsed form of the pathspecs.

This makes a difference e.g. when calling

	git stash -- ':(glob)**/*.txt'

where the original form includes the `:(glob)` prefix while the parsed
form does not.

However, in the built-in `git stash`, we passed the parsed (i.e.
incorrect) form, and `git add` would fail with the error message:

	fatal: pathspec '**/*.txt' did not match any files

at the stage where `git stash` drops the changes from the worktree, even
if `refs/stash` has been actually updated successfully.

This fixes #2037

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

builtin/stash.c

@@ -832,7 +832,7 @@ static void add_pathspecs(struct argv_array *args,
 	int i;
 
 	for (i = 0; i < ps.nr; i++)
-		argv_array_push(args, ps.items[i].match);
+		argv_array_push(args, ps.items[i].original);
 }
 
 /*
@@ -1468,7 +1468,8 @@ static int push_stash(int argc, const char **argv, const char *prefix)
 				     git_stash_push_usage,
 				     0);
 
-	parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL, prefix, argv);
+	parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL | PATHSPEC_PREFIX_ORIGIN,
+		       prefix, argv);
 	return do_push_stash(ps, stash_msg, quiet, keep_index, patch_mode,
 			     include_untracked);
 }

t/t3905-stash-include-untracked.sh

@@ -283,4 +283,10 @@ test_expect_success 'stash -u -- <non-existant> shows no changes when there are
 	test_i18ncmp expect actual
 '
 
+test_expect_success 'stash -u with globs' '
+	>untracked.txt &&
+	git stash -u -- ":(glob)**/*.txt" &&
+	test_path_is_missing untracked.txt
+'
+
 test_done