directory-rename-detection.txt: small updates due to merge-ort optimizations

In commit 0c4fd732f0 ("Move computation of dir_rename_count from
merge-ort to diffcore-rename", 2021-02-27), much of the logic for
computing directory renames moved into diffcore-rename.
directory-rename-detection.txt had claims that all of that logic was
found in merge-recursive.  Update the documentation.

Acked-by: Derrick Stolee <dstolee@microsoft.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/technical/directory-rename-detection.txt b/Documentation/technical/directory-rename-detection.txt
index 49b83ef3cc4be5dfed9e80f3edc11fd10c64fda6..029ee2cedc5d38d6b6f0b08de6bd6951455f0e2e 100644 (file)
--- a/Documentation/technical/directory-rename-detection.txt
+++ b/Documentation/technical/directory-rename-detection.txt
@@ -2,9 +2,9 @@ Directory rename detection
 ==========================
 
 Rename detection logic in diffcore-rename that checks for renames of
-individual files is aggregated and analyzed in merge-recursive for cases
-where combinations of renames indicate that a full directory has been
-renamed.
+individual files is also aggregated there and then analyzed in either
+merge-ort or merge-recursive for cases where combinations of renames
+indicate that a full directory has been renamed.
 
 Scope of abilities
 ------------------
@@ -88,9 +88,11 @@ directory rename detection support in:
     Folks have requested in the past that `git diff` detect directory
     renames and somehow simplify its output.  It is not clear whether this
     would be desirable or how the output should be simplified, so this was
-    simply not implemented.  Further, to implement this, directory rename
-    detection logic would need to move from merge-recursive to
-    diffcore-rename.
+    simply not implemented.  Also, while diffcore-rename has most of the
+    logic for detecting directory renames, some of the logic is still found
+    within merge-ort and merge-recursive.  Fully supporting directory
+    rename detection in diffs would require copying or moving the remaining
+    bits of logic to the diff machinery.
 
   * am