dotnet/roslyn

The "current line" indicator disappeared when deleting spaces twice

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#33,254 opened on Feb 8, 2019

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 (4 comments) (0 reactions) (0 assignees)C# (20,414 stars) (4,257 forks)batch import
Area-InteractiveBugInteractive-Debugginghelp wanted

Description

Version Used: Visual Studio 2019 Preview 2

🔗 Originally filed as https://devdiv.visualstudio.com/DevDiv/_workitems/edit/238276

Steps to Reproduce:

  1. Use the following code:

    static void Main(string[] args)
{
    int a, b, c, d;
    a = 1;
    b = 2;
    c = 3;
    d = 4;
}

  2. Set a breakpoint on c = 3;

  3. Start debugging and wait for the breakpoint to get hit

  4. Delete the spaces before c = 3;

  5. Press Ctrl+Z

  6. Repeat step (4)

Expected Behavior:

The debugger still shows c = 3; as the current line (with the yellow arrow).

Actual Behavior:

After step (6), the yellow arrow goes away and the current line is now shown.

Contributor guide

Tech stack
csharp
Domain
tooling
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
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.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C# programmingDebugger concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
The bug occurs in the debugger's current line indicator (yellow arrow) when deleting spaces twice and undoing after a breakpoint hit. To reproduce, follow the steps in the issue. The fix likely involves the editor's handling of breakpoint hit indications, possibly in the Roslyn debugger integration code (e.g., in EditorFeatures or Debugger folders). Investigate how the arrow is updated after text changes, especially the undo/redo logic. Check the issue comments for any prior analysis or linked code.