Merge branch 'tr/maint-show-walk' into maint

"git show"'s auto-walking behaviour was an unreliable and
unpredictable hack; it now behaves just like "git log" does when it
walks.

* tr/maint-show-walk:
  show: fix "range implies walking"
  Demonstrate git-show is broken with ranges

builtin/log.c

@@ -462,6 +462,9 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 	opt.tweak = show_rev_tweak_rev;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 
+	if (!rev.no_walk)
+		return cmd_log_walk(&rev);
+
 	count = rev.pending.nr;
 	objects = rev.pending.objects;
 	for (i = 0; i < count && !ret; i++) {