INotifyDataErrorInfo Error Message is overflowing the TextBox inside a DataGrid

Bug explanation

Is anyone here having the same problem when using INotifyDataErrorInfo where the Error Message of the TextBox is overflowing? No issue when using ValidationRules at all.

I have a DataGrid with 100 items, each item has a TextBox. In my ViewModel, I implemented the INotifyDataErrorInfo. For some reason, if all of the Error Message is shown below the TextBox, some of them are overflowing. I tried using ValidationRules but everything is fine, the problem occurs only when using INotifyDataErrorInfo.

Here is an example of the issue when all of the error is being shown.

Could this be an issue with the DataGrid? The first 20 items are showing the error message in the correct position, but after that until the end of the items is not.

UPDATE: I tried to input the correct entry in the TextBox, then remove the text by clicking the clear icon of the TextBox. After that, the position of the Error Message is corrected, but then I tried to scroll and the problem occur again.

• I tried typing some text.
  

• Then cleared the text by clicking the clear icon. (Noticed that the position of the error message is corrected)
  

• Retype some text. (Everything is fine as of now)
  

• I tried to scroll, going down. (Problem occurred again)
  

• Then scroll again, going up. (Still the same problem)
  

Version

using version 4.5.0

首先，在包含 100 个 TextBox 项、使用 INotifyDataErrorInfo 验证以及报告中的 MaterialDesignInXamlToolkit 4.5.0 版本的 WPF DataGrid 中重现该问题。比较使用 ValidationRules、清除文本和滚动时的行为。完成的标准是：在编辑和滚动期间，所有行的验证消息都保持正确定位。