Add Comments to Block Save Images

Fixed the issue where text in comment blocks disappears when the user
downloads blocks as images

Change-Id: I00339e03fda72d3b563631b536e6391ee05332b5

appinventor/blocklyeditor/src/exportBlocksImage.js

@@ -68,8 +68,16 @@ function styles(el, selectorRemap) {
 out$.svgAsDataUri = function(el, optmetrics, options, cb) {
   options = options || {};
   options.scale = options.scale || 1;
-  var xmlns = "http://www.w3.org/2000/xmlns/";  
+  var xmlns = "http://www.w3.org/2000/xmlns/";
   var outer = document.createElement("div");
+
+  var textAreas = document.getElementsByTagName("textarea");
+
+  for (var i = 0; i < textAreas.length; i++)
+  {
+    textAreas[i].innerHTML = textAreas[i].value;
+  }
+
   var clone = el.cloneNode(true);
   var width, height;
   if(el.tagName == 'svg') {
@@ -181,4 +189,4 @@ out$.saveSvgAsPng = function(el, name, optmetrics, options) {
 Blockly.ExportBlocksImage.onclickExportBlocks = function(metrics) {
   context : this;  
   saveSvgAsPng(document.getElementById("blockly_Svg"), "blocks.png", metrics);
-}
\ No newline at end of file
+}