gc: do not explode objects which will be immediately pruned

diff --git a/builtin/diff-tree.c b/builtin/diff-tree.c
index 0d2a3e9fa2023cc673f1f6d9e17d3deeca1c7e9d..be6417d166abf428d379a70b9d67f894da4641d1 100644 (file)
--- a/builtin/diff-tree.c
+++ b/builtin/diff-tree.c
@@ -163,6 +163,9 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix)
        }
 
        if (read_stdin) {
+               int saved_nrl = 0;
+               int saved_dcctc = 0;
+
                if (opt->diffopt.detect_rename)
                        opt->diffopt.setup |= (DIFF_SETUP_USE_SIZE_CACHE |
                                               DIFF_SETUP_USE_CACHE);
@@ -173,9 +176,16 @@ int cmd_diff_tree(int argc, const char **argv, const char *prefix)
                                fputs(line, stdout);
                                fflush(stdout);
                        }
-                       else
+                       else {
                                diff_tree_stdin(line);
+                               if (saved_nrl < opt->diffopt.needed_rename_limit)
+                                       saved_nrl = opt->diffopt.needed_rename_limit;
+                               if (opt->diffopt.degraded_cc_to_c)
+                                       saved_dcctc = 1;
+                       }
                }
+               opt->diffopt.degraded_cc_to_c = saved_dcctc;
+               opt->diffopt.needed_rename_limit = saved_nrl;
        }
 
        return diff_result_code(&opt->diffopt, 0);