Invalid marks in schema are not removed

Bug report

With this schema it shouldn’t be possible to have any marks in the heading-one block:

const schema = {
  blocks: {
    'heading-one': {
      nodes: [{ objects: ['text'] }],
      marks: []
    }
  }
};

But as you can see I’m able to insert bold text in it:

What’s the current behavior?

You can see this behaviour in action here: https://youtu.be/mfI3U3KX9ug

To reproduce I’m just toggling a mark without actually making a selection and then simply writing.

[isubasti]

@SmilinBrian you might want to use something like https://github.com/ianstormtaylor/slate-plugins/tree/master/packages/slate-auto-replace rather than validateNode for that

[zhujinxuan]

@PierBover Yes, you can fix it here: packages/slate/src/changes/by-key in insertTextAtRange

  if (normalize !== undefined) {
    normalize = range.isExpanded
  }

to something like

  if (normalize !== undefined) {
    normalize = range.isExpanded && marks.size !== 0
  }