VS Code: File links in sidebar open in new editor group instead of existing one

Description

When Claude Code is placed in the VS Code sidebar, clicking file links (e.g., from Read tool results) opens files in a new editor group (group 2) instead of the existing editor group (group 1).

Expected behavior

Files should open in the first/active editor group (group 1), not create a new editor group.

Current behavior

1. Claude Code is placed in the sidebar (via preferredLocation: sidebar)
2. Claude Code displays a file path (e.g., from a Read tool result)
3. Clicking the file link creates a new editor group (group 2) and opens the file there
4. This leaves an unwanted empty or split layout

Environment

• VS Code (latest)
• Claude Code extension

Workaround

Setting "workbench.editor.closeEmptyGroups": true helps clean up empty groups, but files still open in group 2 instead of group 1.

Suggestion

Add a setting to control which editor group file links open in, or default to opening in the first/existing editor group.