Merge branch 'dk/blame-move-no-reason-for-1-line-context'

"git blame -M" missed a single line that was moved within the file.

* dk/blame-move-no-reason-for-1-line-context:
blame: require 0 context lines while finding moved lines with -M

diff --combined builtin/blame.c
index 1e214bd4ec2161ff0a9620f6433f43a3407c4c9e,a3f68747326836fff7b1f99ce3e5b858f77f97ab..2ed83e16b63cf11435ba156a6dc201df0f46b4f8
--- 1/builtin/blame.c
--- 2/builtin/blame.c
+++ b/builtin/blame.c
@@@ -56,7 -56,7 +56,7 @@@ static int show_progress
  static struct date_mode blame_date_mode = { DATE_ISO8601 };
  static size_t blame_date_width;
  
 -static struct string_list mailmap;
 +static struct string_list mailmap = STRING_LIST_INIT_NODUP;
  
  #ifndef DEBUG
  #define DEBUG 0
@@@ -134,7 -134,7 +134,7 @@@ struct progress_info 
        int blamed_lines;
  };
  
- static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b, long ctxlen,
+ static int diff_hunks(mmfile_t *file_a, mmfile_t *file_b,
                      xdl_emit_hunk_consume_func_t hunk_func, void *cb_data)
  {
        xpparam_t xpp = {0};
@@@ -142,7 -142,6 +142,6 @@@
        xdemitcb_t ecb = {NULL};
  
        xpp.flags = xdl_opts;
-       xecfg.ctxlen = ctxlen;
        xecfg.hunk_func = hunk_func;
        ecb.priv = cb_data;
        return xdi_diff(file_a, file_b, &xpp, &xecfg, &ecb);
@@@ -609,7 -608,7 +608,7 @@@ static struct origin *find_origin(struc
                }
        }
        diff_flush(&diff_opts);
 -      free_pathspec(&diff_opts.pathspec);
 +      clear_pathspec(&diff_opts.pathspec);
        return porigin;
  }
  
@@@ -651,7 -650,7 +650,7 @@@ static struct origin *find_rename(struc
                }
        }
        diff_flush(&diff_opts);
 -      free_pathspec(&diff_opts.pathspec);
 +      clear_pathspec(&diff_opts.pathspec);
        return porigin;
  }
  
@@@ -980,7 -979,7 +979,7 @@@ static void pass_blame_to_parent(struc
        fill_origin_blob(&sb->revs->diffopt, target, &file_o);
        num_get_patch++;
  
-       if (diff_hunks(&file_p, &file_o, 0, blame_chunk_cb, &d))
+       if (diff_hunks(&file_p, &file_o, blame_chunk_cb, &d))
                die("unable to generate diff (%s -> %s)",
                    oid_to_hex(&parent->commit->object.oid),
                    oid_to_hex(&target->commit->object.oid));
@@@ -1129,7 -1128,7 +1128,7 @@@ static void find_copy_in_blob(struct sc
         * file_p partially may match that image.
         */
        memset(split, 0, sizeof(struct blame_entry [3]));
-       if (diff_hunks(file_p, &file_o, 1, handle_split_cb, &d))
+       if (diff_hunks(file_p, &file_o, handle_split_cb, &d))
                die("unable to generate diff (%s)",
                    oid_to_hex(&parent->commit->object.oid));
        /* remainder, if any, all match the preimage */
@@@ -1343,7 -1342,7 +1342,7 @@@ static void find_copy_in_parent(struct 
        } while (unblamed);
        target->suspects = reverse_blame(leftover, NULL);
        diff_flush(&diff_opts);
 -      free_pathspec(&diff_opts.pathspec);
 +      clear_pathspec(&diff_opts.pathspec);
  }
  
  /*
@@@ -2425,7 -2424,8 +2424,7 @@@ static struct commit *find_single_final
                struct object *obj = revs->pending.objects[i].item;
                if (obj->flags & UNINTERESTING)
                        continue;
 -              while (obj->type == OBJ_TAG)
 -                      obj = deref_tag(obj, NULL, 0);
 +              obj = deref_tag(obj, NULL, 0);
                if (obj->type != OBJ_COMMIT)
                        die("Non commit %s?", revs->pending.objects[i].name);
                if (found)
@@@ -2460,7 -2460,8 +2459,7 @@@ static char *prepare_initial(struct sco
                struct object *obj = revs->pending.objects[i].item;
                if (!(obj->flags & UNINTERESTING))
                        continue;
 -              while (obj->type == OBJ_TAG)
 -                      obj = deref_tag(obj, NULL, 0);
 +              obj = deref_tag(obj, NULL, 0);
                if (obj->type != OBJ_COMMIT)
                        die("Non commit %s?", revs->pending.objects[i].name);
                if (sb->final)
@@@ -2520,12 -2521,12 +2519,12 @@@ int cmd_blame(int argc, const char **ar
        enum object_type type;
        struct commit *final_commit = NULL;
  
 -      static struct string_list range_list;
 -      static int output_option = 0, opt = 0;
 -      static int show_stats = 0;
 -      static const char *revs_file = NULL;
 -      static const char *contents_from = NULL;
 -      static const struct option options[] = {
 +      struct string_list range_list = STRING_LIST_INIT_NODUP;
 +      int output_option = 0, opt = 0;
 +      int show_stats = 0;
 +      const char *revs_file = NULL;
 +      const char *contents_from = NULL;
 +      const struct option options[] = {
                OPT_BOOL(0, "incremental", &incremental, N_("Show blame entries as we find them, incrementally")),
                OPT_BOOL('b', NULL, &blank_boundary, N_("Show blank SHA-1 for boundary commits (Default: off)")),
                OPT_BOOL(0, "root", &show_root, N_("Do not treat root commits as boundaries (Default: off)")),