Dropdown position is incorrect when using fullscreen inside layout builder

Problem/Motivation

Using fullscreen when CKEditor is inside a dialog, like off-canvas in layout builder results in positioning the dropdowns incorrectly.

Steps to reproduce

1. With fresh Drupal 10 installation.
2. Enable layout builder and configure "Article" content type to use it.
3. Enable the module and add the plugin to Basic HTML text format.
4. Go to the layout page for "Article" content type.
5. Click "Add block", then "Create content block"
6. Click on fullscreen button
7. Notice how the dropdowns are positioned incorrectly resulting in having most of the options cut out.

Proposed resolution

Not sure yet.

Remaining tasks

User interface changes

API changes

Data model changes