A GitHub issue on microsoft/vscode (#338035, opened Sep 25, 2026 by user kidCaulfield, closed as duplicate). The claim: on VS Code 1.139.0 Universal, macOS 26.5.1, rounded corners have appeared on the text editor, file explorer, terminal, and Copilot chat, with no extension required to reproduce — the reporter considers the curves a distraction and wants sharp corners back. Assigned to Hawk Ticehurst, tagged only as a duplicate, so the canonical thread with any actual maintainer rationale or workarounds lives elsewhere; the source doesn't say whether a setting exists to disable it. Practitioner takeaway: this is a design-change complaint, not a functional defect, and it's been folded into a parent issue. If the rounded corners bother you, subscribing to the duplicate target is the actionable move, not filing a new one. The bench practically wrote this thread itself: presumably Cupertino shipped the corner radius, and sells the square corners back separately. Also, Copilot chat being one of the infected panels suggests Satya put the radius in himself, via the toaster key.