doc: core.ignoreStat update, and clarify the --assume-unchanged effect

The assume-unchanged bit, and consequently core.ignoreStat, can be
misunderstood. Be assertive about the expectation that file changes should
notified to Git.

Overhaul the general wording thus:
    1. direct description of what is ignored given first.
    2. example instruction of the user manual action required.
    3. use sideways indirection for assume-unchanged and update-index
       references.
    4. add a 'normally' to give leeway for the change detection.

Signed-off-by: Philip Oakley <philipoakley@iee.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2415d58..493ab19 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -364,15 +364,19 @@ This is useful for excluding servers inside a firewall from
 proxy use, while defaulting to a common proxy for external domains.
 
 core.ignoreStat::
-       If true, commands which modify both the working tree and the index
-       will mark the updated paths with the "assume unchanged" bit in the
-       index. These marked files are then expected to stay unchanged in the
-       working tree. If you change them you should mark their update manually.
-       Git will normally not detect the file changes by lstat() calls.
-       This is useful on systems where those calls are very slow, such as
-       cifs/Microsoft Windows.
-       See linkgit:git-update-index[1].
-       False by default.
+       If true, Git will avoid using lstat() calls to detect if files have
+       changed by setting the "assume-unchanged" bit for those tracked files
+       which it has updated identically in both the index and working tree.
++
+When files are modified outside of Git, the user will need to stage
+the modified files explicitly (e.g. see 'Examples' section in
+linkgit:git-update-index[1]).
+Git will not normally detect changes to those files.
++
+This is useful on systems where lstat() calls are very slow, such as
+CIFS/Microsoft Windows.
++
+False by default.
 
 core.preferSymlinkRefs::
        Instead of the default "symref" format for HEAD