Add contextMenuPlugin.submenuTitle to docs and test.

I noticed that the arrow only renders properly in some cases. For this reason, the submenuTitle only works sometimes.
josdejong · Jul 18, 2017 · fbd082d · fbd082d
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diff --git a/docs/api.md b/docs/api.md
@@ -221,6 +221,10 @@ Constructs a new JSONEditor.
 
      The callback function when the custom action is clicked. Called with the selected node.
 
+  - `{string} submenuTitle`
+
+     The submenu expander's title (tooltip) text, for example `A longer description of the submenu`.
+
   - `{Object[]} submenu`
 
      Submenu items of the same type as `contextMenuPlugins`.
@@ -249,6 +253,10 @@ Constructs a new JSONEditor.
 
      The callback function when the custom action is clicked. Called with the selected nodes.
 
+  - `{string} submenuTitle`
+
+     The submenu expander's title (tooltip) text, for example `A longer description of the submenu`.
+
   - `{Object[]} submenu`
 
      Submenu items of the same type as `multiContextMenuPlugins`.

diff --git a/test/test_plugins.html b/test/test_plugins.html
@@ -85,6 +85,7 @@
         text: 'Submenu',
         title: 'Action with submenu',
         className: 'jsoneditor-action2',
+        submenuTitle: 'A title for the submenu expand button',
         submenu: [
           {
             text: 'Submenu 1',
@@ -122,6 +123,7 @@
           alert('Action 3');
           alert(node);
         },
+        submenuTitle: 'Another title for a different submenu expand button',
         submenu: [
           {
             text: 'Submenu 1',