[PATCH v2 3/4] rebase: note `preserve` merges may be a pull config option

["Philip Oakley via GitGitGadget" <gitgitgadget@gmail.com>]

From: Philip Oakley <philipoakley@iee.email>

The `--preserve-merges` option was removed by v2.34.0. However
users may not be aware that it is also a Pull configuration option,
which is still offered by major IDE vendors such as Visual Studio.

Extend the `--preserve-merges` die message to also direct users to
the possible use of the `preserve` option in the `pull.rebase` config.
This is an additional 'belt and braces' information statement.

Signed-off-by: Philip Oakley <philipoakley@iee.email>
---
 builtin/rebase.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 17cc776b4b1..5f8921551e1 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -1205,7 +1205,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 			     builtin_rebase_usage, 0);
 
 	if (preserve_merges_selected)
-		die(_("--preserve-merges was replaced by --rebase-merges"));
+		die(_("--preserve-merges was replaced by --rebase-merges\n"
+			"Note: Your `pull.rebase` configuration may also be  set to 'preserve',\n"
+			"which is no longer supported; use 'merges' instead"));
 
 	if (action != ACTION_NONE && total_argc != 2) {
 		usage_with_options(builtin_rebase_usage,
-- 
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