fix: crash when drag & drop on macOS

Author: love-linger

src/Views/InteractiveRebase.axaml.cs

@@ -43,6 +43,7 @@ private void OnRowHeaderPointerPressed(object sender, PointerPressedEventArgs e)
         private void OnRowHeaderDragOver(object sender, DragEventArgs e)
         {
             if (DataContext is ViewModels.InteractiveRebase vm &&
+                e.Data.Contains("InteractiveRebaseItem") &&
                 e.Data.Get("InteractiveRebaseItem") is ViewModels.InteractiveRebaseItem src &&
                 sender is Border { DataContext: ViewModels.InteractiveRebaseItem dst } border &&
                 src != dst)

src/Views/LauncherTabBar.axaml.cs

@@ -216,7 +216,8 @@ private void OnPointerMovedOverTab(object sender, PointerEventArgs e)
 
         private void DropTab(object sender, DragEventArgs e)
         {
-            if (e.Data.Get("MovedTab") is ViewModels.LauncherPage moved &&
+            if (e.Data.Contains("MovedTab") &&
+                e.Data.Get("MovedTab") is ViewModels.LauncherPage moved &&
                 sender is Border { DataContext: ViewModels.LauncherPage to } &&
                 to != moved)
             {

src/Views/Welcome.axaml.cs

@@ -73,7 +73,7 @@ private void SetupTreeNodeDragAndDrop(object sender, RoutedEventArgs _)
             }
         }
 
-        private void OnTreeViewKeyDown(object sender, KeyEventArgs e)
+        private void OnTreeViewKeyDown(object _, KeyEventArgs e)
         {
             if (TreeContainer.SelectedItem is ViewModels.RepositoryNode node && e.Key == Key.Enter)
             {
@@ -163,7 +163,7 @@ private void DragOverTreeView(object sender, DragEventArgs e)
 
         private void DropOnTreeView(object sender, DragEventArgs e)
         {
-            if (e.Data.Get("MovedRepositoryTreeNode") is ViewModels.RepositoryNode moved)
+            if (e.Data.Contains("MovedRepositoryTreeNode") && e.Data.Get("MovedRepositoryTreeNode") is ViewModels.RepositoryNode moved)
             {
                 e.Handled = true;
                 ViewModels.Welcome.Instance.MoveNode(moved, null);
@@ -224,7 +224,8 @@ private void DropOnTreeNode(object sender, DragEventArgs e)
                 return;
             }
 
-            if (e.Data.Get("MovedRepositoryTreeNode") is ViewModels.RepositoryNode moved)
+            if (e.Data.Contains("MovedRepositoryTreeNode") && 
+                e.Data.Get("MovedRepositoryTreeNode") is ViewModels.RepositoryNode moved)
             {
                 e.Handled = true;