ckeditor / ckeditor5 / 3209c7e7-fc78-455f-80ca-6ca6773bf747

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Merge pull request #17071 from ckeditor/cc/4371-3

Fix (engine): Fixed incorrect marker handling in some scenarios involving undo and real-time collaboration, which earlier led to a `model-nodelist-offset-out-of-bounds` error. See #9296.

Fix (engine): Fixed incorrect handling of merge changes during undo in some scenarios involving real-time collaboration, which earlier led to a `model-nodelist-offset-out-of-bounds` error. See #9296.

Fix (engine): Fixed conflict resolution error, which led to editor crash in some scenarios where two users removed bigger intersecting part of the content and used undo. See #9296.

Fix (engine): Fixed incorrect undo behavior leading to an editor crash when a user pressed enter key multiple times, then pressed backspace that many times, then undo all the changes. Closes #9296.

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