Sometimes on cache hits, IE will execute the script before it has eve…

…n added it to the DOM, remember what script is currently being added, and if it gets added during the appendChild operation (and there is nothing in interactive state), use that script.

tests/browsertests/scriptloadinteractive/index.html

@@ -16,6 +16,7 @@
         useInteractive = false,
         loadedScripts = [],
         callCount = 0,
+        currentlyAddingScript,
         waitingFunc, loadUrls,
         urls = [
             "one.js",
@@ -75,7 +76,6 @@
             }
         }
     }
-
     function attachScript(url, name, useDocWrite) {
         if (noCache) {
             url += "?stamp=" + (new Date()).getTime();
@@ -94,8 +94,10 @@
             useInteractive = true;
             node.attachEvent("onreadystatechange", onTestScriptLoad);
         }
+        currentlyAddingScript = node;
 
         document.getElementsByTagName("head")[0].appendChild(node);
+        currentlyAddingScript = null;
     }
 
     loadUrls = function () {
@@ -105,10 +107,12 @@
     };
 
     function def(func) {
-        var scripts, script, i;
+        var scripts, i, script = currentlyAddingScript;
         if (useInteractive) {
             scripts = document.getElementsByTagName('script');
+            var states = [];
             for (i = scripts.length - 1; i > -1; i--) {
+                states.push(i + scripts[i].readyState + scripts[i].src);
                 //log('script with name ' + scripts[i].getAttribute('data-name') + ' has readyState = ' + scripts[i].readyState + ' for func: ' + func);
                 if (scripts[i].readyState === 'interactive') {
                     script = scripts[i];
@@ -117,6 +121,7 @@
             }
             if (!script) {
                 log("ERROR: No matching script interactive for " + func);
+                log("script readyStates are: " + states);
             }
             //log('calling finishScript for interactive dat-name: ' + script.getAttribute('data-name'));
             finishScript(script, func);