Cursor flicker when hovering the pointer on the selected text in RichTextBox
- Dominant language
- C#
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Description
* .NET Core Version: 3.1.300-preview-015095
* Have you experienced this same bug with .NET Framework?: Yes
**Minimal repro:**
1. Create a new Winforms Core application
2. Drag and drop a RichTextBox to the form designer
3. Build and run this application
4. Type some words in the RichTextBox and select some text
5. Hover the pointer on the select text and observer the cursor
Or
Run the attached project [CursorFlickerPrj.zip](https://github.com/dotnet/winforms/files/4479150/CursorFlickerPrj.zip) and repeat step4 & step5.
**Expected behavior:**
The cursor is not flicker.
**Actual behavior:**
The cursor is flicker.
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