Do not use diff_from_common_commit

.github/workflows/pr-code-format.yml

@@ -60,7 +60,6 @@ jobs:
           START_REV: ${{ github.event.pull_request.base.sha }}
           END_REV: ${{ github.event.pull_request.head.sha }}
           CHANGED_FILES: ${{ steps.changed-files.outputs.all_changed_files }}
-        # Using --diff_from_common_commit option available in clang-format-19
         run: |
           python ./External/code-format-helper/code-format-helper.py \
             --repo "FEX-emu/FEX" \

External/code-format-helper/code-format-helper.py

@@ -214,7 +214,6 @@ class ClangFormatHelper(FormatHelper):
             self.clang_fmt_path,
             "--binary=clang-format-19",
             "--diff",
-            "--diff_from_common_commit",
         ]
 
         if args.start_rev and args.end_rev: