Switch to Model view when dragging items from the file system

- Issue MatterHackers/MCCentral#4781
DragDrop STL from desktop to printing GCode view fails to switch to
model view

MatterControlLib/ApplicationView/BedConfig.cs

@@ -193,6 +193,11 @@ namespace MatterHackers.MatterControl
 		}
 
 		public InsertionGroupObject3D AddToPlate(IEnumerable<ILibraryItem> itemsToAdd)
+		{
+			return this.AddToPlate(itemsToAdd, (this.Printer != null) ? this.Printer.Bed.BedCenter : Vector2.Zero, true);
+		}
+
+		public InsertionGroupObject3D AddToPlate(IEnumerable<ILibraryItem> itemsToAdd, Vector2 initialPosition, bool moveToOpenPosition)
 		{
 			if (this.Printer != null
 				&& this.Printer.ViewState.ViewMode != PartViewMode.Model)
@@ -211,10 +216,13 @@ namespace MatterHackers.MatterControl
 						itemsToAdd,
 						context.View3DWidget,
 						scene,
-						(Printer != null) ? Printer.Bed.BedCenter : Vector2.Zero,
+						initialPosition,
 						(item, itemsToAvoid) =>
 						{
-							PlatingHelper.MoveToOpenPositionRelativeGroup(item, itemsToAvoid);
+							if (moveToOpenPosition)
+							{
+								PlatingHelper.MoveToOpenPositionRelativeGroup(item, itemsToAvoid);
+							}
 						}));
 			});
 

MatterControlLib/DesignTools/Primitives/ImageObject3D.cs

@@ -92,7 +92,6 @@ namespace MatterHackers.MatterControl.DesignTools
 						var graphics2D = _image.NewGraphics2D();
 						graphics2D.Clear(Color.White);
 						graphics2D.DrawString("Bad Load", 100, 100);
-
 					}
 
 					// we don't want to invalidate on the mesh change

MatterControlLib/DesignTools/Primitives/TextObject3D.cs

@@ -142,7 +142,6 @@ namespace MatterHackers.MatterControl.DesignTools
 						}
 					});
 
-
 					if (aabb.ZSize > 0)
 					{
 						// If the part was already created and at a height, maintain the height.

MatterControlLib/PartPreviewWindow/View3D/View3DWidget.cs

@@ -999,13 +999,8 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 			// Set the hitplane to the bed plane
 			CurrentSelectInfo.HitPlane = bedPlane;
 
-			var insertionGroup = new InsertionGroupObject3D(
-				items,
-				this,
-				Scene,
-				Vector2.Zero,
-				null,
-				trackSourceFiles);
+			// Add item to scene
+			var insertionGroup = sceneContext.AddToPlate(items, Vector2.Zero, moveToOpenPosition: false);
 
 			// Find intersection position of the mouse with the bed plane
 			var intersectInfo = GetIntersectPosition(screenSpaceMousePosition);
@@ -1020,11 +1015,6 @@ namespace MatterHackers.MatterControl.PartPreviewWindow
 
 			this.deferEditorTillMouseUp = true;
 
-			// Add item to scene and select it
-			Scene.Children.Modify(list =>
-			{
-				list.Add(insertionGroup);
-			});
 			Scene.SelectedItem = insertionGroup;
 
 			this.DragDropObject = insertionGroup;