[webkit-patch] Include commit messages in patches (Follow-up)

https://bugs.webkit.org/show_bug.cgi?id=240256
<rdar://problem/92982358>

Unreviewed follow-up fix.

* Tools/Scripts/webkitpy/common/checkout/scm/git.py:
(Git.create_patch): Prefer commit specified by user.

Canonical link: https://commits.webkit.org/250560@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294194 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Tools/ChangeLog

@@ -1,3 +1,14 @@
+2022-05-14  Jonathan Bedard  <JonWBedard@gmail.com>
+
+        [webkit-patch] Include commit messages in patches (Follow-up) 
+        https://bugs.webkit.org/show_bug.cgi?id=240256
+        <rdar://problem/92982358>
+
+        Unreviewed follow-up fix.
+
+        * Scripts/webkitpy/common/checkout/scm/git.py:
+        (Git.create_patch): Prefer commit specified by user.
+
 2022-05-13  Jonathan Bedard  <jbedard@apple.com>
 
         [webkit-patch] Apply patches commit messages

Tools/Scripts/webkitpy/common/checkout/scm/git.py

@@ -372,6 +372,8 @@ def create_patch(self, git_commit=None, changed_files=None, git_index=False):
 
         if git_index:
             command += ['--cached']
+        elif git_commit:
+            command += [merge_base]
         elif merge_base != head:
             command += ['HEAD...{}'.format(merge_base)]