XAML WPF DataGrid: reduce columns width to fit its content while scrolling except one

Here is the solution to automatically reduce DataGrid columns width during scrolling. I need a slightly modified version where last column fills all row width left after other columns.

The old solution:

private void OnLoadingRow(object sender, DataGridRowEventArgs e)
{
    if (sender is not DataGrid dg) return;
    foreach (var c in dg.Columns) c.Width = 0;
    e.Row.UpdateLayout();
    foreach (var c in dg.Columns) c.Width = DataGridLength.Auto;
}

If dg.Columns.Last().Width = new DataGridLength(1, DataGridLengthUnitType.Star); added at the end of the method last column not respects other columns Auto size and forces its size to 20px (see the pic).

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