Moving Item to a location next to a disabled item causes the application to freeze

[zndxcvbn]

There is a situation when there is a disabled item in the DataGrid. This item has the IsEnabled="False" property set. When such an item is at the very top (the first in the DataGrid) and when trying to move any other item above such an item, the program hangs. It seems that the program gets stuck in the BaseDataGridDropHandler.cs > FindDataGridRowFromChildView method in a loop.

Below I have provided an example to reproduce this behavior:

<DataGrid.Styles>
  <Style Selector="DataGridRow" x:DataType="vm:ItemViewModel">
    <Setter Property="Interaction.Behaviors">
      <Setter.Value>
        <BehaviorCollectionTemplate>
          <BehaviorCollection>
            <DataTriggerBehavior Binding="{Binding Title}" Value="Item0">
              <ChangePropertyAction PropertyName="IsEnabled" Value="False" />
            </DataTriggerBehavior>
          </BehaviorCollection>
        </BehaviorCollectionTemplate>
      </Setter.Value>
    </Setter>
  </Style>
</DataGrid.Styles>

[zndxcvbn]

I tried to track where the cursor goes in the visual tree, it seems it goes beyond the DataGrid:

private static DataGridRow? FindDataGridRowFromChildView(StyledElement sourceChild)
{
    int maxDepth = 16;
    DataGridRow? row = null;
    StyledElement? current = sourceChild;
    while (maxDepth --> 0 || row is null)
    {
        if (current is DataGridRow dgr)
            row = dgr;
     
        Debug.WriteLine($"Traversing to parent: {current.GetType().Name}");
        current = current?.Parent;
    }
    return row;
}

Debug:

Traversing to parent: Rectangle
Traversing to parent: Grid
Traversing to parent: Border
Traversing to parent: Grid
Traversing to parent: DataGridRowHeader
Traversing to parent: DataGridFrozenGrid
Traversing to parent: Border
Traversing to parent: DataGridRow
Traversing to parent: DataGridRowsPresenter
Traversing to parent: Grid
Traversing to parent: Border
Traversing to parent: DataGrid
Traversing to parent: Grid
Traversing to parent: TabItem
Traversing to parent: TabControl
Traversing to parent: MainWindow

I found a workaround in the following:
BaseDataGridDropHandler.cs

public override bool Validate(object? sender, DragEventArgs e, object? sourceContext, object? targetContext, object? state)
{
    if (e.Source is Control c && sender is DataGrid dg)
    {
        bool valid = Validate(dg, e, sourceContext, targetContext, false);
        if (valid)
        {
            var row = FindDataGridRowFromChildView(c);
            if (row != null)
            {
                string direction = e.Data.Contains("direction") ? (string)e.Data.Get("direction")! : "down";
                ApplyDraggingStyleToRow(row!, direction);
                ClearDraggingStyleFromAllRows(sender, exceptThis: row);
            }
        }
        return valid;
    }
    ClearDraggingStyleFromAllRows(sender);
    return false;
}
private static DataGridRow? FindDataGridRowFromChildView(StyledElement sourceChild)
{
    int maxDepth = 16;
    DataGridRow? row = null;
    StyledElement? current = sourceChild;
    while (maxDepth --> 0 || row is null)
    {
        if (current is DataGridRow dgr)
        {
            row = dgr;
            break;
        }
        if (current is DataGrid)
        {
            break;
        }

        current = current?.Parent;
    }
    return row;
}