Add option to keep existing IDs

Uploading a patch that implements a setting to keep existing IDs when filtering.

Can you please add a test case for this?

Good call. Here's a updated patch with a unit test for the new option.

I was looking for the same thing in order to make this module work with the CKEditor ID Attributes module → . The latest patch does the job, after enabling the new option in the text format.

Thanks! I'd like to verify in our build, then I'll happily merge.

This works for me. I've just started testing the module with this patch, and everything is good so far.

After updating to Drupal 10.3, with this patch installed and its functionality in use on two existing text formats, I'm getting this error when I try to save a new text format:

'keep_existing_ids' is not a supported key.

It does not matter if the new format has the "Automatically apply identifiers (anchors) to headings in content" filter is enabled or not. The error occurs either way.

Removing the patch does fix it, which makes sense since that key identified is pretty clearly tied to this patch.

I'm not sure what the fix is - is there something else that needs to be done to declare that key as supported?

I added the necessary config schema. Should be fixed in the MR.

Thank you. I think that's good again. I tested with the patch option (not overriding existing) still on, removing the patch option, and removing having the filter entirely. No errors from any of them.