Pass focus/blur events and tabindex attr to textarea (fixes #162)

Author: WebCoder49

code-input.js

@@ -37,6 +37,7 @@ var codeInput = {
      */
     textareaSyncAttributes: [
         "value",
+        "tabindex",
         // Form validation - https://developer.mozilla.org/en-US/docs/Learn/Forms/Form_validation#using_built-in_form_validation
         "min", "max",
         "type",
@@ -70,7 +71,11 @@ var codeInput = {
         "change",
         "selectionchange",
         "invalid",
-        "input"
+        "input",
+        "focus",
+        "blur",
+        "focusin",
+        "focusout"
     ],
 
     /* ------------------------------------
@@ -957,6 +962,14 @@ var codeInput = {
             return val;
         }
 
+        // Synchronise blur and focus
+        focus(options={}) {
+            return this.textareaElement.focus(options);
+        }
+        blur(options={}) {
+            return this.textareaElement.blur(options);
+        }
+
         /**
          * Get the placeholder of the code-input element that appears
          * when no code has been entered.