Return LESS/SCSS instead of CSS language when in a LESS/SCSS file

src/extensions/default/LESSSupport/main.js

@@ -36,5 +36,11 @@ define(function (require, exports, module) {
         fileExtensions: ["less"],
         blockComment: ["/*", "*/"],
         lineComment: ["//"]
+    }).done(function (lessLanguage) {
+        // Hack to make it so that when we see a "css" mode inside a LESS file,
+        // we know that it's really LESS. Ideally we would have a way to get the
+        // actual mime type from CodeMirror, so we know what mode configuration is
+        // in use (see #7345).
+        lessLanguage._setLanguageForMode("css", lessLanguage);
     });
 });

src/language/LanguageManager.js

@@ -874,6 +874,10 @@ define(function (require, exports, module) {
         // Similarly, the php mode uses clike internally for the PHP parts
         var php = getLanguage("php");
         php._setLanguageForMode("clike", php);
+
+        // Similar hack to the above for dealing with SCSS/CSS.
+        var scss = getLanguage("scss");
+        scss._setLanguageForMode("css", scss);
 
         // The fallback language for unknown modes and file extensions
         _fallbackLanguage = getLanguage("unknown");