refactor: streamline session option group selection logic and improve test coverage

[DonJayamanne]

No description provided.

[Copilot]

Pull request overview

This PR refactors Copilot CLI session option-group selection behavior (repo/branch/isolation) to produce more consistent defaults—especially in welcome-view (MRU) scenarios—and expands unit test coverage around these flows. It also starts returning locked option values for existing sessions so the session UI can reflect the resolved/locked selections.

Changes:

• Auto-select the first MRU repository in welcome view (and fall back to the first item when a previous selection is no longer present).
• When branch selection is locked (workspace isolation), ignore any previous branch selection and snap back to HEAD; adjust locked branch group items accordingly.
• For existing sessions, populate ChatSession.options with locked option values derived from the existing-session input-state groups.

Show a summary per file

File	Description
extensions/copilot/src/extension/chatSessions/vscode-node/test/sessionOptionGroupBuilder.spec.ts	Updates/extends tests to cover new selection/locking behavior for MRU repo + branch groups.
extensions/copilot/src/extension/chatSessions/vscode-node/sessionOptionGroupBuilder.ts	Refines welcome-view repository selection and locked-branch selection behavior.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessions.ts	Adds locked option values to existing session content and removes an unused no-op handler.

Copilot's findings

• Files reviewed: 3/3 changed files
• Comments generated: 2

[github-actions]

Screenshot Changes

Base: 1028f069 Current: 0c80bc19

Changed (2)

agentSessionsViewer/WithBadge/Dark

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agentSessionsViewer/WithBadge/Light

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[Copilot]

Pull request overview

Refactors Copilot CLI session dropdown handling to derive selections from ChatSessionInputState (instead of legacy option payloads), while expanding unit coverage for selection/locking behavior in welcome-view and branch/isolation scenarios.

Changes:

• Add ChatSessionContext.inputState to the proposed sessions provider API and deprecate initialSessionOptions.
• Centralize extraction of selected folder/branch/isolation from ChatSessionInputState and update session initialization call sites accordingly.
• Expand tests around option group building, default selections, and lock/reset behavior.

Show a summary per file

File	Description
extensions/copilot/src/extension/vscode.proposed.chatSessionsProvider.d.ts	Deprecates initialSessionOptions and introduces inputState on ChatSessionContext; clarifies command arg behavior.
extensions/copilot/src/extension/chatSessions/vscode-node/sessionOptionGroupBuilder.ts	Adds helper to read selected options from input state; adjusts default selection and locked-branch behavior; simplifies input-state rebuild path.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessions.ts	Switches request/session init plumbing to pass selections derived from input state; populates options for existing sessions from locked groups.
extensions/copilot/src/extension/chatSessions/vscode-node/copilotCLIChatSessionInitializer.ts	Refactors initializer APIs to take a chat resource + structured init options rather than parsing legacy option entries.
extensions/copilot/src/extension/chatSessions/vscode-node/test/sessionOptionGroupBuilder.spec.ts	Adds/updates unit tests for new selection extraction and welcome-view/locking behaviors.
extensions/copilot/src/extension/chatSessions/vscode-node/test/chatSessionInitializer.spec.ts	Updates tests to match the initializer API refactor and option-passing changes.
extensions/copilot/package.json	Bumps vscodeCommit pointer.

Copilot's findings

• Files reviewed: 6/7 changed files
• Comments generated: 2