MA0075: Fix false-positive for array element reference operations (#601)

Author: meziantou

src/Meziantou.Analyzer/Internals/CultureSensitiveFormattingContext.cs

@@ -206,6 +206,9 @@ public bool IsCultureSensitiveOperation(IOperation operation, CultureSensitiveOp
 
         if (operation is IDefaultValueOperation defaultValue)
             return IsCultureSensitiveType(defaultValue.Type, format: null, instance: null, options);
+        
+        if (operation is IArrayElementReferenceOperation arrayElementReference)
+            return IsCultureSensitiveType(arrayElementReference.Type, format: null, instance: null, options);
 
         // Unknown operation
         return true;

tests/Meziantou.Analyzer.Test/Rules/DoNotUseImplicitCultureSensitiveToStringAnalyzerTests.cs

@@ -125,6 +125,24 @@ await CreateProjectBuilder()
               .ValidateAsync();
     }
 
+    [Fact]
+        public async Task Concat_Char_String_NoDiagnostic()
+    {
+        var sourceCode = """
+            class Test
+            {
+                void A(char[] c)
+                {
+                    string str = "";
+                    str = c[0] + str;
+                }
+            }
+            """;
+        await CreateProjectBuilder()
+              .WithSourceCode(sourceCode)
+              .ValidateAsync();
+    }
+
     [Theory]
     [InlineData("abc[|{(sbyte)-1}|]")]
     [InlineData("abc[|{(short)-1}|]")]