Made invalidate args so we can pass source and invalidate type

Rebuild does not propagate to parent

PartPreviewWindow/View3D/Actions/SubtractEditor.cs

@@ -243,7 +243,8 @@ namespace MatterHackers.MatterControl.PartPreviewWindow.View3D
 						transformedKeep.Transform(inverse);
 
 						keep.Mesh = transformedKeep;
-						keep.Invalidate();
+						// TODO: make this the subtract object when it is available
+						keep.Invalidate(new InvalidateArgs(keep, InvalidateType.Content));
 
 						percentCompleted += amountPerOperation;
 						progressStatus.Progress0To1 = percentCompleted;