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[PATCH] diff: allow --recurse-submodules as an synonym for --submodule

Many commands have flags to recurse into submodules, which is named
--recurse-submodules. The diff family also has a submodule recursion flag,
but that is named differently. Add a synonym --recurse-submodules, which
means the same as the --submodule flag, such that across all git commands
supporting submodules we have the --recurse-submodules flag available.

Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
 Documentation/diff-options.txt | 1 +
 diff.c                         | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 0378cd574eb..694c97338c9 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -227,6 +227,7 @@ linkgit:git-config[1]).
 	of the `--diff-filter` option on what the status letters mean.
 	Specify how differences in submodules are shown.  When specifying
 	`--submodule=short` the 'short' format is used.  This format just
 	shows the names of the commits at the beginning and end of the range.
diff --git a/diff.c b/diff.c
index 145cfbae592..d3d5a989bd1 100644
--- a/diff.c
+++ b/diff.c
@@ -5023,6 +5023,8 @@ int diff_opt_parse(struct diff_options *options,
 		handle_ignore_submodules_arg(options, arg);
 	} else if (skip_to_optional_arg_default(arg, "--submodule", &arg, "log"))
 		return parse_submodule_opt(options, arg);
+	else if (skip_to_optional_arg_default(arg, "--recurse-submodules", &arg, "log"))
+		return parse_submodule_opt(options, arg);
 	else if (skip_prefix(arg, "--ws-error-highlight=", &arg))
 		return parse_ws_error_highlight_opt(options, arg);
 	else if (!strcmp(arg, "--ita-invisible-in-index"))