"Assume unchanged" git: do not set CE_VALID with --refresh

When working with automatic assume-unchanged mode using
core.ignorestat, setting CE_VALID after --refresh makes things
more cumbersome to use.  Consider this scenario:

 (1) the working tree is on a filesystem with slow lstat(2).
     The user sets core.ignorestat = true.

 (2) "git checkout" to switch to a different branch (or initial
     checkout) updates all paths and the index starts out with
     "all clean".

 (3) The user knows she wants to edit certain paths.  She uses
     update-index --no-assume-unchanged (we could call it --edit;
     the name is inmaterial) to mark these paths and starts
     editing.

 (4) After editing half of the paths marked to be edited, she
     runs "git status".  This runs "update-index --refresh" to
     reduce the false hits from diff-files.

 (5) Now the other half of the paths, since she has not changed
     them, are found to match the index, and CE_VALID is set on
     them again.

For this reason, this commit makes update-index --refresh not to
set CE_VALID even after the path without CE_VALID are verified
to be up to date.  The user still can run --really-refresh to
force lstat() to match the index entries to the reality.
Signed-off-by: NJunio C Hamano <junkio@cox.net>

update-index.c

@@ -172,6 +172,15 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 	memcpy(updated, ce, size);
 	fill_stat_cache_info(updated, &st);
 
+	/* In this case, if really is not set, we should leave
+	 * CE_VALID bit alone.  Otherwise, paths marked with
+	 * --no-assume-unchanged (i.e. things to be edited) will
+	 * reacquire CE_VALID bit automatically, which is not
+	 * really what we want.
+	 */
+	if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
+		updated->ce_flags &= ~htons(CE_VALID);
+
 	return updated;
 }