Bug 423352 - Remove support for CSS, Java, JSON, JS

src/js/codeMirrorPlugin.js

@@ -87,7 +87,20 @@ require([
 			"application/xml": ["xml"],
 			"text/x-yaml": ["yaml", "yml"]
 		};
-
+		/**
+		 * Filters out Content Types that are handled natively by Orion. We do not want to override their highlighting.
+		 */
+		function isNonNativeContentType(ct) {
+			switch (ct.id) {
+				case "application/javascript":
+				case "application/json":
+				case "text/css":
+				case "text/html":
+				case "text/x-java":
+					return false;
+			}
+			return true;
+		}
 		function getMimeForContentTypeId(contentTypeId) {
 			return contentType2Mime[contentTypeId] || contentTypeId;
 		}
@@ -110,7 +123,7 @@ require([
 					extension: mime2Ext[mime],
 					"extends": "text/plain"
 				};
-			});
+			}).filter(isNonNativeContentType);
 		}
 		function createForm() {
 			var list = document.getElementById("modelist");