feat: support checked syndication targets

[paulrobertlloyd]

This PR attempts to add support for the checked property that can be returned in a query for an endpoint’s syndication targets.

I thought it might be as easy as adding the following to the individual checkboxes:

  m('label', [
    s.name,
    m('input', {
      type: 'checkbox',
+     checked: s.checked,
      onchange: e => updateSyndicateTo(e, s)
    })
  ])

While that worked, it prevented the checkboxes from being toggled. Also, updateSyndicateTo updates the mp-syndicate-to property when a checkbox is interacted with; with pre-checked checkboxes, a user might not interact with these form elements at all.

So instead I’m now calculating which syndication checkboxes have been checked on form submit.

However, perhaps given the way Mithril.js works – maybe updating and reseting the DOM on every event, I’m not sure – interacting with any other form element will reset the checkboxes back to their original state.

Hopefully there is enough here to begin reviewing this feature, and just a small change is needed to make this PR work as intended.

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[benjifs]

Nice. I hadn't seen that proposal before so I appreciate the PR to get this added.

I just added a fix to get the checkbox to stop reverting to default state on any other input change so it should be good to go now.

[paulrobertlloyd]

🙌 Thanks for the quick review and merge.