merge(3p/git): Merge git upstream at v2.26.2 r/808

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+Git 2.25.2 Release Notes
+========================
+
+Fixes since v2.25.1
+-------------------
+
+ * Minor bugfixes to "git add -i" that has recently been rewritten in C.
+
+ * An earlier update to show the location of working tree in the error
+   message did not consider the possibility that a git command may be
+   run in a bare repository, which has been corrected.
+
+ * The "--recurse-submodules" option of various subcommands did not
+   work well when run in an alternate worktree, which has been
+   corrected.
+
+ * Running "git rm" on a submodule failed unnecessarily when
+   .gitmodules is only cache-dirty, which has been corrected.
+
+ * "git rebase -i" identifies existing commits in its todo file with
+   their abbreviated object name, which could become ambigous as it
+   goes to create new commits, and has a mechanism to avoid ambiguity
+   in the main part of its execution.  A few other cases however were
+   not covered by the protection against ambiguity, which has been
+   corrected.
+
+ * The index-pack code now diagnoses a bad input packstream that
+   records the same object twice when it is used as delta base; the
+   code used to declare a software bug when encountering such an
+   input, but it is an input error.
+
+ * The code to automatically shrink the fan-out in the notes tree had
+   an off-by-one bug, which has been killed.
+
+ * "git check-ignore" did not work when the given path is explicitly
+   marked as not ignored with a negative entry in the .gitignore file.
+
+ * The merge-recursive machinery failed to refresh the cache entry for
+   a merge result in a couple of places, resulting in an unnecessary
+   merge failure, which has been fixed.
+
+ * Fix for a bug revealed by a recent change to make the protocol v2
+   the default.
+
+ * "git merge signed-tag" while lacking the public key started to say
+   "No signature", which was utterly wrong.  This regression has been
+   reverted.
+
+ * MinGW's poll() emulation has been improved.
+
+ * "git show" and others gave an object name in raw format in its
+   error output, which has been corrected to give it in hex.
+
+ * Both "git ls-remote -h" and "git grep -h" give short usage help,
+   like any other Git subcommand, but it is not unreasonable to expect
+   that the former would behave the same as "git ls-remote --head"
+   (there is no other sensible behaviour for the latter).  The
+   documentation has been updated in an attempt to clarify this.
+
+Also contains various documentation updates, code clean-ups and minor fixups.