Try again with non-sparse and using origin prefix

.github/workflows/ci.yml

@@ -12,6 +12,10 @@ jobs:
     runs-on: windows-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          # Force a non-shallow checkout, so that clang-format can access source history to compare against
+          # See https://github.com/actions/checkout for more details.
+          fetch-depth: 0
 
       - name: Find vcvars64.bat
         run: |
@@ -30,7 +34,7 @@ jobs:
             exit /b %ERRORLEVEL%
           )
 
-          git clang-format refs/remotes/origin/master --binary "%CLANG_FORMAT%" --style file -- cppwinrt/*.h cppwinrt/*.cpp fast_fwd/*.h fast_fwd/*.cpp prebuild/*.h prebuild/*.cpp scratch/*.h scratch/*.cpp strings/*.h strings/*.cpp test/*.h test/*.cpp vsix/*.h vsix/*.cpp
+          git clang-format origin/master --binary "%CLANG_FORMAT%" --style file -- cppwinrt/*.h cppwinrt/*.cpp fast_fwd/*.h fast_fwd/*.cpp prebuild/*.h prebuild/*.cpp scratch/*.h scratch/*.cpp strings/*.h strings/*.cpp test/*.h test/*.cpp vsix/*.h vsix/*.cpp
 
           if %ERRORLEVEL% neq 0 (
             echo ::error::This branch contains changes that have not been formatted with 'clang-format',