editable div test case for #939

Author: adumesny

demo/serialization.html

@@ -18,6 +18,7 @@ <h1>Serialization demo</h1>
     <a onClick="loadFullGrid()" class="btn btn-primary" href="#">Load Full</a>
     <a onClick="clearGrid()" class="btn btn-primary" href="#">Clear</a>
     <br/><br/>
+    <div contentEditable="true">Editable Div</div>
     <div id="gridCont"><div class="grid-stack"></div></div>
     <hr/>
     <textarea id="saved-data" cols="100" rows="20" readonly="readonly"></textarea>
@@ -38,7 +39,8 @@ <h1>Serialization demo</h1>
 
     let serializedData = [
       {x: 0, y: 0, w: 2, h: 2, id: '0'},
-      {x: 3, y: 1, h: 2, id: '1', content: "<button onclick=\"alert('clicked!')\">Press me</button><div>text area</div><div><textarea></textarea></div><div>Input Field</div><input type='text'>"},
+      {x: 3, y: 1, h: 2, id: '1', 
+      content: "<button onclick=\"alert('clicked!')\">Press me</button><div>text area</div><div><textarea></textarea></div><div>Input Field</div><input type='text'><div contentEditable=\"true\">Editable Div</div>"},
       {x: 4, y: 1, id: '2'},
       {x: 2, y: 3, w: 3, id: '3'},
       {x: 1, y: 3, id: '4'}