Fix widget 'Multiple generic suggestion (advanced)' when used in a multi-valued complex property

Widget 'Multiple generic suggestion (advanced)' used for a multi-valued string property in a multi-valued complex property does not save updates when there is only 1 item in the multi-valued complex property.

How to reproduce:

Configuration in Studio

Automation scriting

Create a new Automation Scripting named NXP24700 with:

• a parameter named searchTerm
• Output type blob
• the following code:

  function run(input, params) {
    Console.warn('Filter: ' + params.searchTerm);
  
    // initialize basic suggestions array
    var suggestions = [];
    suggestions.push({'id':0, 'displayLabel':'0'});
    suggestions.push({'id':1, 'displayLabel':'1'});
    suggestions.push({'id':2, 'displayLabel':'2'});
    
    // filter array based on 'searchTerm' parameter
    function filter_suggestions(entry) {
      return entry['displayLabel'].startsWith(params.searchTerm);
    }
    var filteredSuggestions = suggestions.filter(filter_suggestions);
    
    // build blob to return to suggestion widget
    ctx.resultsString = JSON.stringify(filteredSuggestions);
    var resultsBlob = Context.RestoreBlobInputFromScript(null, {
      script: 'This=new org.nuxeo.ecm.core.api.impl.blob.StringBlob(resultsString,"application/json");'
    });
    return resultsBlob;
  }
  

Document type

• define a new document type named NXP-24700
• in schema tab, add a multi-valued complex field named complexlist
• edit the complexlist field and add a multi-valued string field named field1
• in the Edit layout tab, select schema nxp-24700 under Widgets by property section of Featured Widgets and drag and drop Complexlist on the WARNING widget in column Column 1 of the layout
• edit the widget and set attribute Display to Table and save
• edit Complexlist widget's subwidget Field1 and change its Widget Type to Multiple generic suggestion (advanced) and save
• edit Field1 subwidget and:
  • set Minimum characters to 0
  • set Operation Id to javascript.NXP24700
  • set Inline javascript to:

    function myformatter(doc) {
      return doc.id;
    }
    

  • set Selection Formatter to myformatter
  • remove custom property listTemplateItem if defined
• save the document type
• edit layout View layout and import the Edit layout. Save the document type
• deploy the Studio project in a Nuxeo instance

Reproduction in Nuxeo instance

• create a workspace named NXP-24700
• create a document of type NXP-24700 (fill the mandatory field Title)
• go to Edit tab, add an item to Complexlist field and select 0 in field Field1
• click Save
• back in Summary tab, Complexlist field has 1 item with Field1 set to 0
• go to Edit tab again, add 1 to field Field1 of existing item of field Complexlist
• click Save

Expected result: back in Summary tab, Complexlist field has 1 item with Field1 set to 0 and 1.

Actual result: back in Summary tab, Complexlist field has 1 item with Field1 set to 0 ONLY.
The problem only occurs when the field Complexlist contains only 1 item.

Workaround: Add a 2nd empty item to field Complexlist, then, updates to Field1 get saved.