Update: lint code block with same extension but different content

lib/linter/linter.js

@@ -1308,9 +1308,9 @@ class Linter {
                 return [];
             }
 
-            // Resolve configuration again if the file extension was changed.
-            if (configForRecursive && path.extname(blockName) !== originalExtname) {
-                debug("Resolving configuration again because the file extension was changed.");
+            // Resolve configuration again if the file content or extension was changed.
+            if (configForRecursive && (text !== blockText || path.extname(blockName) !== originalExtname)) {
+                debug("Resolving configuration again because the file content or extension was changed.");
                 return this._verifyWithConfigArray(
                     blockText,
                     configForRecursive,

tests/lib/eslint/eslint.js

@@ -2917,6 +2917,54 @@ describe("ESLint", () => {
                 assert.strictEqual(results[0].messages[0].ruleId, "post-processed");
             });
 
+            it("should run processors when calling lintText with processor resolves same extension but different content correctly", async () => {
+                let count = 0;
+
+                eslint = new ESLint({
+                    useEslintrc: false,
+                    overrideConfig: {
+                        plugins: ["test-processor"],
+                        overrides: [{
+                            files: ["**/*.txt/*.txt"],
+                            rules: {
+                                "no-console": 2,
+                                "no-unused-vars": 2
+                            }
+                        }]
+                    },
+                    extensions: ["txt"],
+                    ignore: false,
+                    plugins: {
+                        "test-processor": {
+                            processors: {
+                                ".txt": {
+                                    preprocess(text) {
+                                        count++;
+                                        return [
+                                            {
+
+                                                // it will be run twice, and text will be as-is at the second time, then it will not run third time
+                                                text: text.replace("a()", "b()"),
+                                                filename: ".txt"
+                                            }
+                                        ];
+                                    },
+                                    postprocess(messages) {
+                                        messages[0][0].ruleId = "post-processed";
+                                        return messages[0];
+                                    }
+                                }
+                            }
+                        }
+                    }
+                });
+                const results = await eslint.lintText("function a() {console.log(\"Test\");}", { filePath: "tests/fixtures/processors/test/test-processor.txt" });
+
+                assert.strictEqual(count, 2);
+                assert.strictEqual(results[0].messages[0].message, "'b' is defined but never used.");
+                assert.strictEqual(results[0].messages[0].ruleId, "post-processed");
+            });
+
             describe("autofixing with processors", () => {
                 const HTML_PROCESSOR = Object.freeze({
                     preprocess(text) {