Where does the bug appear (feature/product)?
Cursor IDE
Describe the Bug
After upgrading Cursor, the REST Client extension (Huachao Mao — no extension update) sends HTTP requests successfully (status bar shows timing), but the response panel/tab never appears unless I manually split the editor first (Ctrl+).
The extension itself has not changed; this appears to be a Cursor editor API / layout regression introduced by the Cursor upgrade.
Steps to Reproduce
- Install REST Client extension (v0.25.0)
- Open a .http file with a request
- Click Send Request
- Observe: status bar shows request completed, but no response tab opens
- Split editor with Ctrl+, send request again → response appears in the split panel
Expected Behavior
Response tab opens automatically beside the request editor, same as earler version of Cursor.
Operating System
Windows 10/11
Version Information
Version: 3.7.42
VSCode Version: 1.105.1
Commit: 5702c9cfca656d8710fad58402fe37f14345e3a0
Date: 2026-06-15T19:39:42.738Z
Build Type: Stable
Release Track: Default
OS: Windows_NT x64 10.0.19045
Architecture: x64
Layout: Editor (Agent sidebar open, auxiliary bar width ~885px)
Theme: Cursor Dark Midnight
REST Client: 0.25.0 (humao.rest-client, publisher: Huachao Mao)
REST Client config: rest-client.previewColumn not customized (default: “beside”)
Additional Information
Root Cause (suspected)
REST Client resolves the preview column via window.activeTextEditor.viewColumn + 1 when rest-client.previewColumn is beside (default). On Cursor, viewColumn is often undefined (e.g. when the Agent/Chat panel is open), so preview column resolution fails silently — the HTTP request completes but no response tab is created.
Related upstream discussion (same symptom, same workaround): Expriencing Issue on Cursor · Issue #1434 · Huachao/vscode-restclient · GitHub
This is a Cursor compatibility issue, not an extension change.
Does this stop you from using Cursor
No - Cursor works, but with this issue