feat: 添加数据网格指针移动事件处理，以支持悬停项的识别

Author: heartacker

src/Views/Histories.axaml

@@ -44,6 +44,7 @@
                 Loaded="OnCommitListLoaded"
                 LayoutUpdated="OnCommitListLayoutUpdated"
                 SelectionChanged="OnCommitListSelectionChanged"
+                PointerMoved="OnDataGridPointerMoved"
                 ContextRequested="OnCommitListContextRequested"
                 DoubleTapped="OnCommitListDoubleTapped"
                 KeyDown="OnCommitListKeyDown">

src/Views/Histories.axaml.cs

@@ -235,6 +235,28 @@ private void OnCommitListSelectionChanged(object _, SelectionChangedEventArgs e)
             e.Handled = true;
         }
 
+        private object _hoveredItem;
+
+        private void OnDataGridPointerMoved(object sender, PointerEventArgs e)
+        {
+            var dataGrid = sender as DataGrid;
+            var point = e.GetPosition(dataGrid);
+            var visual = dataGrid.InputHitTest(point) as Control;
+
+            // 向上找 DataGridRow
+            while (visual != null && !(visual is Avalonia.Controls.DataGridRow))
+                visual = visual.Parent as Control;
+
+            if (visual is Avalonia.Controls.DataGridRow row)
+            {
+                var item = row.DataContext;
+                if (!Equals(_hoveredItem, item))
+                {
+                    _hoveredItem = item;
+                }
+            }
+        }
+
         private void OnCommitListContextRequested(object sender, ContextRequestedEventArgs e)
         {
             if (sender is DataGrid { SelectedItems: { } selected } dataGrid &&