Fix showing parse error in mode `text` and `preview`

src/js/previewmode.js

@@ -524,16 +524,7 @@ previewmode.get = function() {
   if (this.json === undefined) {
     var text = this.getText();
 
-    try {
+    this.json = util.parse(text); // this can throw an error
-      this.json = util.parse(text); // this can throw an error
-    }
-    catch (err) {
-      // try to sanitize json, replace JavaScript notation with JSON notation
-      text = util.sanitize(text);
-
-      // try to parse again
-      this.json = util.parse(text); // this can throw an error
-    }
   }
 
   return this.json;
@@ -600,10 +591,15 @@ previewmode._setText = function(jsonText, json) {
   if (this.json === undefined) {
     var me = this;
     this.executeWithBusyMessage(function () {
-      // force parsing the json now, else it will be done in validate without feedback
+      try {
-      me.json = me.get();
+        // force parsing the json now, else it will be done in validate without feedback
-      me._renderPreview();
+        me.json = me.get();
-      me._pushHistory();
+        me._renderPreview();
+        me._pushHistory();
+      }
+      catch (err) {
+        // no need to throw an error, validation will show an error
+      }
     }, 'parsing...');
   }
   else {

src/js/textmode.js

@@ -690,20 +690,8 @@ textmode.update = function(json) {
  */
 textmode.get = function() {
   var text = this.getText();
-  var json;
 
-  try {
+  return util.parse(text); // this can throw an error
-    json = util.parse(text); // this can throw an error
-  }
-  catch (err) {
-    // try to sanitize json, replace JavaScript notation with JSON notation
-    text = util.sanitize(text);
-
-    // try to parse again
-    json = util.parse(text); // this can throw an error
-  }
-
-  return json;
 };
 
 /**