Fix \r and \r\n handling in t- and f-string debug texts (#18673)

crates/ruff_python_formatter/tests/normalizer.rs

@@ -196,6 +196,24 @@ impl Transformer for Normalizer {
         transformer::walk_expr(self, expr);
     }
 
+    fn visit_interpolated_string_element(
+        &self,
+        interpolated_string_element: &mut InterpolatedStringElement,
+    ) {
+        let InterpolatedStringElement::Interpolation(interpolation) = interpolated_string_element
+        else {
+            return;
+        };
+
+        let Some(debug) = &mut interpolation.debug_text else {
+            return;
+        };
+
+        // Changing the newlines to the configured newline is okay because Python normalizes all newlines to `\n`
+        debug.leading = debug.leading.replace("\r\n", "\n").replace('\r', "\n");
+        debug.trailing = debug.trailing.replace("\r\n", "\n").replace('\r', "\n");
+    }
+
     fn visit_string_literal(&self, string_literal: &mut ast::StringLiteral) {
         static STRIP_DOC_TESTS: LazyLock<Regex> = LazyLock::new(|| {
             Regex::new(

crates/ruff_python_formatter/tests/snapshots/format@f-string-carriage-return-newline.py.snap

@@ -0,0 +1,27 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/f-string-carriage-return-newline.py
+---
+## Input
+```python
+# Regression test for https://github.com/astral-sh/ruff/issues/18667
+f"{
+1=
+}"
+
+t"{
+1=
+}"
+```
+
+## Output
+```python
+# Regression test for https://github.com/astral-sh/ruff/issues/18667
+f"{
+1=
+}"
+
+t"{
+1=
+}"
+```