Multiple cell selection is (sometimes) lost when it ends beyond the table

[oleq]

📝 Provide detailed reproduction steps (if any)

✔️ Expected result

It should lock at the table boundary and remain the same (b<->r).

❌ Actual result

Sometimes the selection is lost and collapses to a single cell.

📃 Other details

A follow-up of #6113.

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[Reinmar]

There's a chance that #6114 will fix this issue.

[Reinmar]

Fixed along #6114.