[clang-format] Add space between method modifier and a tuple return type in C#

[lbk]

Summary

"public (string name, int age) methodTuple() {}" is now properly spaced

[lbk]

Extend test set by additional values of method_modifier

Updating D85016: [clang-format] Add space between method modifier and a tuple return type in C#

[krasimir]

Thank you!

clang/lib/Format/TokenAnnotator.cpp

if (Left.is(Keywords.kw_var) && Right.is(tok::l_paren))
       return true;
 
     // 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,
                        Keywords.kw_lock))
         return Style.SpaceBeforeParens == FormatStyle::SBPO_ControlStatements ||
                spaceRequiredBeforeParens(Right);
+
+    // space between method modifier and opening parenthesis of a tuple return
+    // type
+    if (Left.isOneOf(tok::kw_public, tok::kw_private, tok::kw_protected,
+                     tok::kw_virtual, tok::kw_extern, tok::kw_static,
+                     tok::kw_new, Keywords.kw_internal, Keywords.kw_abstract,
+                     Keywords.kw_sealed, Keywords.kw_override,
+                     Keywords.kw_async, Keywords.kw_unsafe) &&
+        Right.is(tok::l_paren))
+      return true;
   } else if (Style.Language == FormatStyle::LK_JavaScript) {
     if (Left.is(TT_JsFatArrow))
       return true;
     // for await ( ...
     if (Right.is(tok::l_paren) && Left.is(Keywords.kw_await) && Left.Previous &&
         Left.Previous->is(tok::kw_for))
       return true;
     if (Left.is(Keywords.kw_async) && Right.is(tok::l_paren) &&

clang/unittests/Format/FormatTestCSharp.cpp

foreach ((A a, B b) in someList) {
 
   // space after lock in `lock (processes)`.
   verifyFormat("lock (process)", Style);
 
   Style.SpacesInSquareBrackets = true;
   verifyFormat(R"(private float[ , ] Values;)", Style);
   verifyFormat(R"(string dirPath = args?[ 0 ];)", Style);
   verifyFormat(R"(char[ ,, ] rawCharArray = MakeCharacterGrid();)", Style);
+
+  // Method returning tuple
+  verifyFormat(R"(public (string name, int age) methodTuple() {})", Style);
 }
 
 TEST_F(FormatTestCSharp, CSharpNullableTypes) {
   FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
   Style.SpacesInSquareBrackets = false;
 
   verifyFormat(R"(//
 public class A {