mergetool: Provide an empty file when needed

diff --git a/builtin/commit.c b/builtin/commit.c
index cbc9613ec661bc2cef8274cd66efb06b9cab55b6..b9ab5ef3146ff0536cb79dabf8c77605e4974c31 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -255,8 +255,9 @@ static int list_paths(struct string_list *list, const char *with_tree,
        m = xcalloc(1, i);
 
        if (with_tree) {
-               const char *max_prefix = pathspec_prefix(prefix, pattern);
-               overlay_tree_on_cache(with_tree, max_prefix);
+               char *max_prefix = common_prefix(pattern);
+               overlay_tree_on_cache(with_tree, max_prefix ? max_prefix : prefix);
+               free(max_prefix);
        }
 
        for (i = 0; i < active_nr; i++) {