editor: add invisible submitbutton to prevent deleting mapitems by hitting return

src/c3nav/editor/static/editor/css/editor.css

@@ -19,6 +19,16 @@ body {
     top:2px;
 }
 
+form button.btn.invisiblesubmit {
+    overflow: visible;
+    height: 0;
+    width: 0;
+    margin: 0;
+    border: 0;
+    padding: 0;
+    display: block;
+}
+
 .leaflet-control-layers-toggle {
     color:#000000 !important;
     font-size:14px;

src/c3nav/editor/static/editor/js/editor.js

@@ -525,6 +525,7 @@ editor = {
         editor.sidebar_get(href);
     },
     _sidebar_submit_btn_click: function() {
+        console.log($(this))
         // listener for submit-button-clicks in the sidebar, so the submit event will know which button submitted.
         $(this).closest('form').data('btn', $(this)).clearQueue().delay(300).queue(function() {
             $(this).data('btn', null);

src/c3nav/editor/templates/editor/mapitem.html

@@ -5,6 +5,7 @@
     {% csrf_token %}
     {% bootstrap_form form %}
     {% buttons %}
+    <button class="invisiblesubmit" type="submit"></button>
     {% if not new %}
         <button type="submit" name="delete" value="1" class="btn btn-danger">
             Delete

src/c3nav/editor/templates/editor/mapitem_delete.html

@@ -7,6 +7,7 @@
     <input type="hidden" name="delete" value="1">
     <input type="hidden" name="name" value="{{ name }}">
     {% buttons %}
+    <button class="invisiblesubmit" type="submit"></button>
     <a class="btn btn-default" href="{% url 'editor.mapitems.level' mapitem_type=mapitem_type level='LEVEL' %}" data-insert-level>
         Cancel
     </a>