[Firefox] Selecting widget together with page break results in error

[FilipTokarski]

📝 Provide detailed reproduction steps (if any)

1. In Firefox go to https://ckeditor.com/docs/ckeditor5/latest/features/page-break.html
2. Add image / media embed / html embed right after page break
3. Make selection spanning content - page break - widget

✔️ Expected result

Selection is created, no errors

❌ Actual result

Editor crashes:

Uncaught CKEditorError: model-nodelist-offset-out-of-bounds {"offset":10,"nodeList":[]}
Read more: https://ckeditor.com/docs/ckeditor5/latest/framework/guides/…t/error-codes.html#error-model-nodelist-offset-out-of-bounds
    s https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    offsetToIndex https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    offsetToIndex https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    a https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    get textNode https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    qe https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    _validateSelectionRange https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    m https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    fire https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    _setRanges https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    setTo https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    setTo https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    _setTo https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    setSelection https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    Ft https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    _runPendingChanges https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    change https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    Ft https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    fire https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    _handleSelectionChange https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    observe https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    fire https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    n https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    attach https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    listenTo https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    observe https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    attachDomRoot https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    init https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    create https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    promise callback*create/< https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    create https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    <anonymous> https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    n https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    <anonymous> https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
    <anonymous> https://ckeditor.com/docs/ckeditor5/latest/snippets/features/page-break/snippet.js:4
snippet.js:4:1264

📃 Other details

• Browser: Firefox
• CKEditor version: happens since 19.1.1, before that the selection is broken and there's no way of reproducing this
• Looks similar to Selecting an Image from bottom to top throws exceptions #7892 but has different error message
• You can reproduce this going from top to bottom or from bottom up, but always in this order -> content - page break - widget
• Happens also on latest master on manual tests
• Happens with image or media embed or html embed + page break
• After the crash, you cannot do anything in the editor

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There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).