`moveTableRow` selection is wrong when moving rows with merged cells

[Aslam97]

Description

When moving a row that contains merged cells using moveTableRow, the selection after the move becomes incorrect only if the target index contain a merge cell.
The row itself may move, but the resulting selection does not point to the expected row/cells.

Steps to Reproduce

1. Create a table with merged cells.
2. Place the selection in a row that contains merged cells.
3. Call moveTableRow("down") or moveTableRow("up").
4. Observe that the resulting selection is not aligned with the moved row.

Expected Behavior

• The row should move correctly, and the selection should remain consistent with the moved row.

Actual Behavior

• After the move, the selection points to the next index instead of original index.

Screen.Recording.2025-09-19.at.17.18.27.mov