fix($compile): retain CSS classes added in cloneAttachFn on asynchronous directives

Previously, classes added to asynchronous directive elements during the clone
attach function would not persist after the node is merged with the template, prior
to linking. This change corrects this behaviour and brings it in line with synchronous
directives.

Closes #5439
Closes #5617

1 files changed, 4 insertions, 0 deletions

diff --git a/src/ng/compile.js b/src/ng/compile.js
index 193dff7a..36c23086 100644
--- a/src/ng/compile.js
+++ b/src/ng/compile.js
@@ -1711,9 +1711,13 @@ function $CompileProvider($provide, $$sanitizeUriProvider) {
                 linkNode = $compileNode[0];
 
             if (beforeTemplateLinkNode !== beforeTemplateCompileNode) {
+              var oldClasses = beforeTemplateLinkNode.className;
               // it was cloned therefore we have to clone as well.
               linkNode = jqLiteClone(compileNode);
               replaceWith(linkRootElement, jqLite(beforeTemplateLinkNode), linkNode);
+
+              // Copy in CSS classes from original node
+              safeAddClass(jqLite(linkNode), oldClasses);
             }
             if (afterTemplateNodeLinkFn.transclude) {
               childBoundTranscludeFn = createBoundTranscludeFn(scope, afterTemplateNodeLinkFn.transclude);