Investigate why -ExtendedErrorStackForTestHost inserts tabs at the beginning of some frames

Description

Contributor guide

Tech stack

javascript

Domain

testing

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.

under 1 hour

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.

mostly clear

Prerequisites

Basic JavaScriptUnderstanding of error stack tracesFamiliarity with ChakraCore test structure

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

70

Research direction

Investigate why ExtendedErrorStackForTestHost inserts tabs at the beginning of some error stack frames. The issue references #3120 and suggests a workaround in test/UnitTestFramework/TrimStackTracePath.js by normalizing indentation. Examine this file and related test code to determine the root cause and implement the fix.