Fix list widget with tiny mce editor in toggleable form

Install attached studio project.

Step to reproduce:

• Create a SUPNXP-14273 document
• During the creation , fill at least one entry of the multi complex Complex field.
• Go to the the_tab and click Edit the toggleable form.
• Add an entry to Complexsimpletext field. You can see that at this point that the tinymce editor(s) of the he multi complex Complex is not reinitialized correctly.
• Save

It results in a javascript error:

Cannot read property 'save' of undefined

thrown by

initTinyMCE('640', '400', 'nxl_the_tab_tabLayout:nxw_sub0_toggledForm:nxl_the_form_layout_edit:nxw_complex:nxw_complex_input:0:nxw_sub0_1', 'nuxeolink,fullscreen,nuxeoimageupload', 'en', 'nuxeolink,fullscreen,nuxeoimageupload'); A4J.AJAX.AddListener({onbeforeajax: function() {tinyMCE.getInstanceById('nxl_the_tab_tabLayout:nxw_sub0_toggledForm:nxl_the_form_layout_edit:nxw_complex:nxw_complex_input:0:nxw_sub0_1').save();}});

Note it only fails in a toggleable form. It works in the Edit tab.