bump rename limit defaults (again)

We did this once before in 50705915 (bump rename limit
defaults, 2008-04-30). Back then, we were shooting for about
1 second for a diff/log calculation, and 5 seconds for a
merge.

There are a few new things to consider, though:

  1. Average processors are faster now.

  2. We've seen on the mailing list some ugly merges where
     not using inexact rename detection leads to many more
     conflicts. Merges of this size take a long time
     anyway, so users are probably happy to spend a little
     bit of time computing the renames.

Let's bump the diff/merge default limits from 200/500 to
400/1000. Those are 2 seconds and 10 seconds respectively on
my modern hardware.
Signed-off-by: NJeff King <peff@peff.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

diff.c

@@ -23,7 +23,7 @@
 #endif
 
 static int diff_detect_rename_default;
-static int diff_rename_limit_default = 200;
+static int diff_rename_limit_default = 400;
 static int diff_suppress_blank_empty;
 int diff_use_color_default = -1;
 static const char *diff_word_regex_cfg;

merge-recursive.c

@@ -439,7 +439,7 @@ static struct string_list *get_renames(struct merge_options *o,
 	opts.detect_rename = DIFF_DETECT_RENAME;
 	opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
 			    o->diff_rename_limit >= 0 ? o->diff_rename_limit :
-			    500;
+			    1000;
 	opts.rename_score = o->rename_score;
 	opts.output_format = DIFF_FORMAT_NO_OUTPUT;
 	if (diff_setup_done(&opts) < 0)