Make the init process in editor_textarea.html more robust in cases where the ace.js isn't loaded in 300ms

build_support/editor_textarea.html

@@ -61,16 +61,24 @@ function inject() {
     });
 }
 
+// Call the inject function to load the ace files.
 inject();
 
 var textAce;
-
-setTimeout(function() {
-    var t = document.querySelector("textarea");
+function initAce() {
     var ace = window.__ace_shadowed__;
-    textAce = ace.transformTextarea(t);
-    textAce.setDisplaySettings(true);
-}, 300);
+    // Check if the ace.js file was loaded already, otherwise check back later.
+    if (ace && ace.transformTextarea) {
+        var t = document.querySelector("textarea");
+        textAce = ace.transformTextarea(t);
+        textAce.setDisplaySettings(true);
+    } else {
+        setTimeout(initAce, 100);
+    }
+}
+
+// Transform the textarea on the page into an ace editor.
+initAce();
 
 document.getElementById("buBuild").onclick = function() {
     var injectSrc = inject.toString().split("\n").join("");