What happened?

When using qwen-code's edit file feature that requires user confirmation, the VSCode diff editor that pops up always creates a new editor group to display the diff, instead of opening in the user's currently active editor group.

Steps to reproduce

1. Open qwen-code extension in VSCode
2. Let qwen-code perform a file edit operation (one that requires confirmation)
3. Observe where the diff editor opens

Actual behavior: The diff editor always opens in a newly created editor group.

Related: #2097

What did you expect to happen?

The diff editor should open in the user's currently active editor group (or at least have a configuration option to control this behavior), rather than forcibly creating a new group.

This aligns with VSCode's native diff behavior — when using the vscode.diff command, it defaults to opening in the current editor group or an adjacent group, rather than always creating a new one.

Code Analysis

By examining packages/vscode-ide-companion/src/diff-manager.ts and packages/vscode-ide-companion/src/utils/editorGroupUtils.ts, the current implementation logic is:

1. The showDiff() method attempts to find an editor group to the left of the chat webview
2. If not found, it calls ensureLeftGroupOfChatWebview() which forcibly creates a new group
3. Then opens the diff in that new group

Core code at diff-manager.ts:195-203:

```typescript
let targetViewColumn = findLeftGroupOfChatWebview();
if (targetViewColumn === undefined) {
// If there is no left neighbor, create one to satisfy the requirement of
// opening diffs to the left of the chat webview.
targetViewColumn = await ensureLeftGroupOfChatWebview();
}
```

This design intends to open diffs to the left of the chat webview, but when the user's workspace layout doesn't satisfy this condition, it forcibly creates a new group, affecting user experience.

Client information