Missing `id` for heading tag using richtext toolbar.

[marekndt04]

Description:

In our project we have a model with "content" field built using StreamField. The field uses few different types of blocks. One of them is just RichTextBlock where we have enabled anchors using anchor-identifier feature from this library.

We found a bug that whenever we modify a piece of text to be a heading, the id value is not added to the html data. The process is shown below:

1. We add a simple text with a part meant to be a heading (screenshot # 1)

2. We select this part and use the toolbar to convert it into a heading (screenshot # 2)

3. Save or publish the page model
4. The data stored in the database looks like this (no id)

<h3 data-block-key=\"1ga2c\">I&#x27;m a piece of text meant to be a heading</h3><p data-block-key=\"eqk0d\"></p><p data-block-key=\"3liop\">I&#x27;m just text below</p>

5. Re-saving/publishing adds an empty id value:

<h3 data-block-key=\"4jzq5\" id=\"\">I&#x27;m a piece of text meant to be a heading</h3><p data-block-key=\"eqk0d\"></p><p data-block-key=\"3liop\">I&#x27;m just text below</p>

6. To fix the data we can edit any part of the text inside the block, so adding new text or just deleting and adding a character will help.

Using any other option to create a heading works as expected (using / with the features prompt, or choosing header type from the toolbar before typing any characters).

Django==4.2.6
wagtail==5.2.2
wagtail-draftail-anchors==0.6.0
Python == 3.11

[Mr0grog]

I also experience the same issue on existing text blocks when adding this package (the headings don't have IDs until I edit the field in Draftail/Wagtail Admin).

Is there function or command I can run against each applicable field/stream block in a migration to update existing blocks? This issue is a little frustrating when adding this package to an existing site, but if there’s something I can do in a migration, that would effectively solve it.