SCSS: Fix formatting string value that includes escape \ (#13487)

* Ignore ignoreing escape for `value-string`

* Revert

* Add changelog

changelog_unreleased/scss/13487.md

@@ -0,0 +1,16 @@
+#### Fix formatting string value that includes escape `\` (#13487 by @sosukesuzuki)
+
+<!-- prettier-ignore -->
+```scss
+/* Input */
+$description: "Lorem ipsum dolor sit \"amet\", consectetur adipiscing elit, " +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+/* Prettier stable */
+$description: 'Lorem ipsum dolor sit "amet", consectetur adipiscing elit, '+ "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+/* Prettier main */
+$description: 'Lorem ipsum dolor sit "amet", consectetur adipiscing elit, ' +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+```

src/language-css/printer-postcss.js

@@ -620,6 +620,7 @@ function genericPrint(path, options, print) {
 
         // Ignore escape `\`
         if (
+          iNode.type !== "value-string" &&
           iNode.value &&
           iNode.value.includes("\\") &&
           iNextNode &&

tests/format/scss/quotes/__snapshots__/jsfmt.spec.js.snap

@@ -1,5 +1,38 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`escape-in-string.scss - {"singleQuote":true} format 1`] = `
+====================================options=====================================
+parsers: ["scss"]
+printWidth: 80
+singleQuote: true
+                                                                                | printWidth
+=====================================input======================================
+$description: "Lorem ipsum dolor sit \\"amet\\", consectetur adipiscing elit, " +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+=====================================output=====================================
+$description: 'Lorem ipsum dolor sit "amet", consectetur adipiscing elit, ' +
+  'sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.';
+
+================================================================================
+`;
+
+exports[`escape-in-string.scss format 1`] = `
+====================================options=====================================
+parsers: ["scss"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+$description: "Lorem ipsum dolor sit \\"amet\\", consectetur adipiscing elit, " +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+=====================================output=====================================
+$description: 'Lorem ipsum dolor sit "amet", consectetur adipiscing elit, ' +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";
+
+================================================================================
+`;
+
 exports[`forward-with.scss - {"singleQuote":true} format 1`] = `
 ====================================options=====================================
 parsers: ["scss"]

tests/format/scss/quotes/escape-in-string.scss

@@ -0,0 +1,2 @@
+$description: "Lorem ipsum dolor sit \"amet\", consectetur adipiscing elit, " +
+  "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";