Column resize in nested child table. #19609

📝 Provide detailed reproduction steps (if any)

1. Goto https://ckeditor.com/docs/ckeditor5/latest/features/tables/tables-resize.html#demo
2. Create a new table, then in any cell, create a child table.
3. Drag the resizer in the header cell of child table

✔️ Expected result

The child table column should be resized correctly.

❌ Actual result

The parent table column got resized.

❓ Possible solution

The problem should be caused by this line

When drag resizer in header cell of child table, it will try to find td ancestor, in this scenario, it will find the td cell in parent table instead of the th cell in child table.

📃 Other details

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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