[clang-format] No space inserted between commas in C#

[MyDeveloperDay]

nice, thank you.

clang/lib/Format/TokenAnnotator.cpp

if (Style.isCpp()) {
     // Space before and after '??'.
     if (Left.is(TT_CSharpNullCoalescing) || Right.is(TT_CSharpNullCoalescing))
       return true;
 
     // No space before '?['.
     if (Right.is(TT_CSharpNullConditionalLSquare))
       return false;
 
+    // No space between consecutive commas '[,,]'.
+    if (Left.is(tok::comma) && Right.is(tok::comma))
+      return false;
+
     // Possible space inside `?[ 0 ]`.
     if (Left.is(TT_CSharpNullConditionalLSquare))
       return Style.SpacesInSquareBrackets;
 
     // space between keywords and paren e.g. "using ("
     if (Right.is(tok::l_paren))
       if (Left.isOneOf(tok::kw_using, Keywords.kw_async, Keywords.kw_when))
         return Style.SpaceBeforeParens == FormatStyle::SBPO_ControlStatements ||

clang/unittests/Format/FormatTestCSharp.cpp

verifyFormat(R"(new Dictionary<string, string> { ["Key"] = "Value" };)",
                Style);
   verifyFormat(R"(Apply(x => x.Name, x => () => x.ID);)", Style);
   verifyFormat(R"(bool[] xs = { true, true };)", Style);
   verifyFormat(R"(taskContext.Factory.Run(async () => doThing(args);)", Style);
   verifyFormat(R"(catch (TestException) when (innerFinallyExecuted))", Style);
   verifyFormat(R"(private float[,] Values;)", Style);
   verifyFormat(R"(Result this[Index x] => Foo(x);)", Style);
 
+  verifyFormat(R"(char[,,] rawCharArray = MakeCharacterGrid();)", Style);
+
   Style.SpacesInSquareBrackets = true;
   verifyFormat(R"(private float[ , ] Values;)", Style);
   verifyFormat(R"(string dirPath = args?[ 0 ];)", Style);
+  verifyFormat(R"(char[ ,, ] rawCharArray = MakeCharacterGrid();)", Style);
 }
 
 TEST_F(FormatTestCSharp, CSharpNullableTypes) {
   FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
   Style.SpacesInSquareBrackets = false;
 
   verifyFormat(R"(//
 public class A {