On Change Event collapses list again after data insight has been modified

[KaneFreeman]

Discussed in https://github.com/StaticJsCMS/static-cms/discussions/997

^{Originally posted by mnordhaus November 24, 2023} Hi Community,

I wrote an change event listender so that it calculates the weights for the navigation based on the sort order:

window.CMS.registerEventListener({
            name: 'change',
            collection: 'config',
            field: 'main',
            handler: ({ data, collection, field }) => {
              n = 1;
              let currentValue = [...data.main];
              currentValue.forEach(mainItem => {
                mainItem.weight = n++;
              }); 
              return {...data, main:  currentValue };
            },
        });  

And this is the related collection config:

  - name: config
    label: 'Website Configuration'
    files:
      - name: navigation
        file: config/_default/menus.yaml
        label: 'Navigation'
        
        fields:
          - name: main
            label: Main Navigation
            label_singular: Main Navigation Item
            widget: list
            collapsed: true 
            fields:
              - name: name
                label: 'Name'
                hint: 'Name of the navigation item that gets displayed to the user'
                widget: string
              - name: url
                label: 'Url'
                hint: 'Absolute (e.g. https://exemple.com/page.html) or relative (e.g. ../page.html) url or anchor link (like /#contact or ./#contact).'
                widget: string 
              - name: weight
                label: Weight
                hint: 'The Navigation is sorted by this number'

While it is by design that the collection is initially, collapsed the modification of the data causes that the list will be collapse after I have opened it and made modification. The code itself does what it should and adjusts the weights perfectly fine.

But my expected behavior is that the list keeps uncollapsed after the change.

Any ideas what could be wrong with my code?

Best,

Markus