Your 131072x1 screen size is bogus. expect trouble

[jplummer01]

Severity

P3 - Medium (Minor functionality affected)

Describe the Bug with repro steps

Does this occur consistently? YES
Repro steps:

Right Click -> Open in Designer on a workflow.json file

Action: azureLogicAppsStandard.startDesignTimeApi
Error type: string
Error message: your 131072x1 screen size is bogus. expect trouble
Correlation Id: EF82C1E1-4558-4CE3-8E9E-11DF62069C20
Session id: 65377f99-6081-4e1d-9e5e-9874086c664f1774277960227
Extension version: 5.230.15
Extension bundle version: 1.160.9
OS: linux (Linux 6.6.87.2-microsoft-standard-WSL2)
OS arch: x64
Product: Visual Studio Code - Insiders
Product version: 1.113.0-insider
UTC time: Mon, 23 Mar 2026 15:02:59 GMT

Settings

{
  "dataMapperVersion": 2,
  "validateFuncCoreTools": true,
  "autoRuntimeDependenciesPath": "~/.azurelogicapps/dependencies",
  "autoRuntimeDependenciesValidationAndInstallation": true,
  "parameterizeConnectionsInProjectLoad": true
}

What type of Logic App Is this happening in?

Consumption (Portal)

Are you experiencing a regression?

No response

Which operating system are you using?

Windows

Did you refer to the TSG before filing this issue? https://aka.ms/lauxtsg

Yes

Workflow JSON

Screenshots or Videos

No response

Environment

Browser: Edge Version 147.0.3912.16 (Official build) beta (64-bit)

VS Code Version: Version: 1.113.0-insider (user setup)
Commit: 59b7facd314893d11cc8298572f655c451d92cea
Date: 2026-03-23T14:00:24+01:00
Electron: 39.8.3
ElectronBuildId: 13620978
Chromium: 142.0.7444.265
Node.js: 22.22.1
V8: 14.2.231.22-electron.0
OS: Windows_NT x64 10.0.29553

Extension Version: 5.185.10
Azure CLI Version: 2.84.0

Additional context

No response

[takyyon]

AI Triage Analysis

Component: VS Code Extension / Design-Time API | Priority: P3 | SKU: Standard (VS Code)

Relevant Code

• apps/vs-code-designer/src/app/utils/codeless/startDesignTimeApi.ts — startDesignTimeProcess() spawns the Azure Functions host via cp.spawn() with shell: true
• apps/vs-code-designer/src/app/commands/workflows/openDesigner/openDesignerForLocalProject.ts — Opens designer webview, triggers startDesignTimeApi action

Probable Root Cause

The error message "your 131072x1 screen size is bogus. expect trouble" originates from GNU screen/terminal utilities, not from LogicAppsUX code directly. The startDesignTimeProcess function spawns the Azure Functions Core Tools host using cp.spawn() with shell: true. On WSL2 (Linux 6.6.87.2-microsoft-standard-WSL2 as reported), the spawned shell process inherits a pseudo-terminal size of 131072x1 (131072 = 2^17), which is an invalid dimension. This is a known WSL2/VS Code interaction issue where the terminal dimensions are not properly propagated to child processes. The error is likely non-fatal — the design-time API may still start successfully despite the warning, but the error is surfaced to the user as if it were blocking.

Suggested Investigation

1. Confirm whether the design-time API actually fails to start or if this is just a warning that gets surfaced as an error — check if the designer loads after dismissing the error
2. Check if adding stdio: 'pipe' (instead of inheriting the terminal) to the cp.SpawnOptions in startDesignTimeApi.ts suppresses the terminal size warning
3. This may be a VS Code Insiders + WSL2-specific issue — test on native Linux and Windows to compare behavior

Similar Issues

• No directly matching prior issues found in this repository

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