Fix 'dirty' indicator on 'Code' boxes

Toggle a class on the container instead of changing label text.

edit.html

@@ -67,6 +67,10 @@
 			#sections > div:not(:first-child) {
 				border-top: 2px solid black;
 			}
+			.dirty > label::before {
+				content: "*";
+				font-weight: bold;
+			}
 			#basic-info label {
 				display: inline-block;
 				width: 10em;

edit.js

@@ -85,10 +85,7 @@ function indicateCodeChange(cm) {
 	var clean = cm.isClean(cm.lastChange);
 	if (clean != cm.lastClean) {
 		cm.lastClean = clean;
-		var label = cm.getTextArea().previousElementSibling;
-		if (label) {
-			label.textContent = label.textContent.replace(/\*?$/, clean ? '' : '*');
-		}
+		cm.getTextArea().parentNode.classList[clean ? "remove" : "add"]("dirty");
 	}
 };