Data Editor paste from smaller range marks only part of updated rows as changed

[plucik]

When pasting data copied from a smaller range into a larger selected range, only the rows that match the size of the copied range are marked as changed. Rows updated because of range expansion are not detected as changed.

Steps to reproduce:
1.Open the Data Editor
2.Select a small cell range, e.g., a 2×2 block.
3.Copy the selected range (Ctrl+C or context menu → Copy).
4.Select a larger range to paste into, e.g., a 5×2 block.
5.Paste (Ctrl+V or context menu → Paste).

Expected result:
All rows that were updated during paste should be marked as changed.

Observed result:
Only part of the paste result is treated as changed, even though more rows were actually updated.