[themes] Allow to set a background color for settings / webview editors

Description

Contributor guide

Tech stack

typescript

Domain

frontend

Issue type

feature

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.

half day

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

Understand VS Code theming systemFamiliarity with TypeScript

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

40

Research direction

Investigate how theme colors are defined in the VS Code workbench, specifically in 'src/vs/platform/theme/common/colorRegistry.ts'. Look for existing color definitions like 'editor.background' and see how they are consumed. The request is to add new color keys like 'window.bgColor' for settings and extensions editors. You would need to add new color identifiers to the registry, then apply them in the relevant webview or settings view components. Check the 'src/vs/workbench/contrib/themes' directory for examples of theme extensions. No linked PRs or assignee comments suggest a specific approach, so this requires exploration.