working tree, which was broken.
(merge 339eba65a7 th/backfill-auto-detect-sparseness-fix later to maint).
+ * add_files_to_cache() used diff_files() to detect only the paths that
+ are different between the index and the working tree and add them,
+ which does not need rename detection, which interfered with unnecessary
+ conflicts.
+ (merge c0ce43376b ng/add-files-to-cache-wo-rename later to maint).
+
* Other code cleanup, docfix, build fix, etc.
(merge d79fff4a11 jk/remote-tracking-ref-leakfix later to maint).
(merge 7a747f972d dd/t5403-modernise later to maint).