fix(task-item): fix read only checked handling

[nicksellen]

Fixes #3676

Changes Overview

onReadOnlyChecked allows you to determine whether the checking/unchecking the task item should apply the change, or not.

It did not work because:

• it only ever passed the original node to the function, not the current node
• even if you returned true it would not apply the change to the document

Implementation Approach

Now it runs the logic inside the transaction where we have access to the current node, and we can either abort it as before if it returns false, or allow it to proceed with the transaction if it returns true.

Testing Done

Only manual testing whilst clicking in a browser.

Verification Steps

Configure your editor like this:

new Editor({
    editable: false,
    // + other options
    extensions: [
        TaskItem.configure({
            // Allow checking/unchecking when in read only mode
            onReadOnlyChecked: () => true,
        }),
        // + other extensions
    ]
})    

Then, ideally, open a couple of windows with a collaborative session running, and notice that you can check/uncheck the box in one window, but the change is not propagated to the other.

Additionally, if you want to have more logic (e.g. the kind of logic in #4521 - where the node descendent are checked for matching), it should be possible to observe the node is now the correct node, and can be matched if desired:

onReadOnlyChecked: (node, checked) => {
  editor.state.doc.descendants((subnode, pos) => {
    if (node.eq(subnode)) {
      const { tr } = editor!.state;
      tr.setNodeMarkup(pos, undefined, {
        ...node.attrs,
        checked: checked,
      });
      editor.view.dispatch(tr);
    }
  });
  return true;
},

Additional Notes

There is also another bug, in the update method because it uses checkbox.setAttribute('checked', 'checked') and checkbox.removeAttribute('checked') which is not the correct way to change the state of a checkbox, should just be checkbox.checked = checked.

Should I add a fix to this PR? Maybe best in another one....

Update: I submitted a separate PR for that #5953

Checklist

• I have created a changeset for this PR if necessary.
• My changes do not break the library.
• I have added tests where applicable.
• I have followed the project guidelines.
• I have fixed any lint issues.

Related Issues

#3676
#4521

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