DataGrid RowNumber not updated after delete row #856

Describe the bug
After delete row, the RowNumber will no be updated.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Environment (please complete the following information):

• .net: 5
• IDE vs2019
• Version 3.1.0

Additional context
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