Update SA1011 to not require space before a range operator

#3708

Author: bjornhellander

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/SpacingRules/SA1011CSharp8UnitTests.cs

@@ -106,5 +106,25 @@ public void TestMethod(object?[] arguments)
 
             await VerifyCSharpFixAsync(testCode, expected, fixedCode, CancellationToken.None).ConfigureAwait(false);
         }
+
+        [Fact]
+        [WorkItem(3708, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3708")]
+        public async Task TestClosingSquareBracketFollowedByRangeAsync()
+        {
+            var testCode = @"namespace TestNamespace
+{
+    public class TestClass
+    {
+        public void TestMethod(int[] arg)
+        {
+            _ = arg[0]..;
+            _ = arg[0] ..;
+        }
+    }
+}
+";
+
+            await VerifyCSharpDiagnosticAsync(testCode, DiagnosticResult.EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }

StyleCop.Analyzers/StyleCop.Analyzers/SpacingRules/SA1011ClosingSquareBracketsMustBeSpacedCorrectly.cs

@@ -107,6 +107,7 @@ private static void HandleCloseBracketToken(SyntaxTreeAnalysisContext context, S
                 case SyntaxKind.OpenBracketToken:
                 case SyntaxKind.CloseParenToken:
                 case SyntaxKind.MinusGreaterThanToken:
+                case SyntaxKindEx.DotDotToken:
                     precedesSpecialCharacter = true;
                     break;