ENHANCEMENT: In dev mode, include some basic leak detection functions in the admin panel

admin/code/LeftAndMain.php

@@ -268,7 +268,9 @@ class LeftAndMain extends Controller implements PermissionProvider {
 				FRAMEWORK_DIR . '/javascript/GridField.js',
 			)
 		);
-		
+
+		if (Director::isDev()) Requirements::javascript(FRAMEWORK_ADMIN_DIR . '/javascript/leaktools.js');
+
 		HTMLEditorField::include_js();
 
 		Requirements::combine_files(

admin/javascript/leaktools.js

@@ -0,0 +1,49 @@
+(function($){
+
+	var getHTML = function(el) {
+		var clone = el.cloneNode(true);
+
+		var div = $('<div></div>');
+		div.append(clone);
+
+		return div.html();
+	}
+
+	$.leaktools = {
+
+		logDuplicateElements: function(){
+			var els = $('*');
+			var dirty = false;
+
+			els.each(function(i, a){
+				els.not(a).each(function(j, b){
+					if (getHTML(a) == getHTML(b)) {
+						dirty = true;
+						console.log(a, b);
+					}
+				})
+			})
+
+			if (!dirty) console.log('No duplicates found');
+		},
+
+		logUncleanedElements: function(clean){
+			$.each($.cache, function(){
+				var source = this.handle && this.handle.elem;
+				if (!source) return;
+
+				var parent = source;
+				while (parent && parent.nodeType == 1) parent = parent.parentNode;
+
+				if (!parent) {
+					console.log('Unattached', source);
+					console.log(this.events);
+					if (clean) $(source).unbind().remove();
+				}
+				else if (parent !== document) console.log('Attached, but to', parent, 'not our document', source);
+			})
+		}
+	};
+
+
+})(jQuery);