officejs_support_request_ui: support Ctrl+S in discussion view editor

form_discussion_view embeds an editor, but it did not expose notifySubmit
method to child gadgets. Because using Ctrl+S in the editor calls
notifySubmit on parent gadget, Ctrl+S was causing a page crash.

Expose such a method that would submit a comment when called.

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_pt_form_view_discussable_js.js

@@ -63,6 +63,10 @@
           return gadget.changeState(state_dict);
         });
     })
+    // editor gadget call this acquired method on Ctrl+S
+    .declareMethod("triggerSubmit", function triggerSubmit(e) {
+      return this.submitPostComment(e);
+    })
     .onStateChange(function () {
       var gadget = this;
       // render the erp5 form

bt5/erp5_officejs_support_request_ui/PathTemplateItem/web_page_module/gadget_supportrequest_pt_form_view_discussable_js.xml

@@ -256,8 +256,8 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1594840751.27</float>
-                              <string>UTC</string>
+                              <float>1610600799.71</float>
+                              <string>GMT+1</string>
                             </tuple>
                           </state>
                         </object>

bt5/erp5_officejs_support_request_ui_test/PathTemplateItem/portal_tests/officejs_support_request_ui_zuite/testCheckComment.zpt

@@ -216,6 +216,45 @@ and check that the relative time was updated.
   <td>a few seconds ago</td>
 </tr>
 
+<!-- Ctrl+S can also be used as a shortcut to post message -->
+<tal:block tal:define="text_content string:Post test 4">
+  <tal:block metal:use-macro="container/Zuite_CommonTemplateForRenderjsUi/macros/type_ckeditor_text_content"/>
+</tal:block>
+<tr>
+  <td>selectFrame</td>
+  <td>//div[@data-gadget-scope="editor"]//iframe</td>
+  <td></td>
+</tr>
+<tr>
+  <td>selectFrame</td>
+  <td>//iframe</td>
+  <td></td>
+</tr>
+<tr>
+  <td>controlKeyDown</td>
+  <td></td>
+  <td></td>
+</tr>
+<tr>
+  <td>keyDown</td>
+  <td>//body</td>
+  <td>S</td>
+</tr>
+<tr>
+  <td>controlKeyUp</td>
+  <td></td>
+  <td></td>
+</tr>
+<tr>
+  <td>selectFrame</td>
+  <td>relative=top</td>
+  <td></td>
+</tr>
+<tr>
+  <td>waitForText</td>
+  <td>//ol[@id="post_list"]//li[3]/p</td>
+  <td>Post test 4</td>
+</tr>
 </tbody></table>
   </body>
 </html>
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