dotnet/winforms

Cursor flicker when hovering the pointer on the selected text in RichTextBox

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#3,063 opened on Apr 15, 2020

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area-controls-RichEdithelp wanted

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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 and repeat step4 & step5.

Expected behavior: The cursor is not flicker.

Actual behavior: The cursor is flicker. Flicker333

Contributor guide

Research direction
Investigate the RichTextBox control's handling of cursor changes when text is selected, specifically looking at the WndProc for WM SETCURSOR messages.
Tech stack
csharp
Domain
desktop
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#WinForms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75