Fix #3181 RowSize was not applied when using ItemsProvider without Virtualize (#3182)

Author: vnbaaij

src/Core/Components/DataGrid/FluentDataGridCell.razor.cs

@@ -76,7 +76,7 @@ public partial class FluentDataGridCell<TGridItem> : FluentComponentBase
         .AddStyle("padding-top", "calc(var(--design-unit) * 1.5px)", Column is SelectColumn<TGridItem> && Grid.RowSize == DataGridRowSize.Small && Owner.RowType == DataGridRowType.Default)
         .AddStyle("width", Column?.Width, !string.IsNullOrEmpty(Column?.Width) && Grid.DisplayMode == DataGridDisplayMode.Table)
         .AddStyle("height", $"{Grid.ItemSize:0}px", () => !Grid.EffectiveLoadingValue && Grid.Virtualize && Owner.RowType == DataGridRowType.Default)
-        .AddStyle("height", $"{(int)Grid.RowSize}px", () => !Grid.EffectiveLoadingValue && !Grid.Virtualize && Grid.Items is not null && !Grid.MultiLine)
+        .AddStyle("height", $"{(int)Grid.RowSize}px", () => !Grid.EffectiveLoadingValue && !Grid.Virtualize && !Grid.MultiLine && (Grid.Items is not null || Grid.ItemsProvider is not null))
         .AddStyle("height", "100%", Grid.MultiLine)
         .AddStyle("min-height", "44px", Owner.RowType != DataGridRowType.Default)
         .AddStyle("display", "flex", CellType == DataGridCellType.ColumnHeader && !Grid.HeaderCellAsButtonWithMenu && !Grid.ResizableColumns && (Column is null || (Column!.Sortable.HasValue && !Column!.Sortable.Value)))