Flashing black border on nested widget when deselecting multiple table cells

[FilipTokarski]

📝 Provide detailed reproduction steps (if any)

1. Go to https://ckeditor.com/ckeditor-5/demo/
2. Add a table with nested table, alternatively drag image into the table
3. Select a few cells that contain nested table/image
4. Deselect the cells

✔️ Expected result

Cells get deselected, there are no visual artifacts/glitches.

❌ Actual result

Nested widgets get a flashing black border.

Screencast

0_table2.mp4

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[CKEditorBot]

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

[Witoso]

Still relevant.

[CKEditorBot]

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. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).