Open PR links from chat without a workspace

[Copilot]

Opening a PR link from chat could show an empty overview and throw when the Agents window had no repository manager.

• Manager resolution
  • Adds a shared provider that uses a workspace manager when available and lazily creates a remote-only manager otherwise.
• Link handling
  • Routes both external links and extension URIs through the provider.
  • Prevents undefined managers and duplicate remote-only manager instances.

• Fixes #334873

[azure-pipelines]

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[Copilot]

🟢 Approval recommended

The changes consistently centralize manager resolution for no-workspace scenarios and include targeted tests validating the new behavior.

Pull request overview

This PR fixes opening GitHub issue/PR links (including from chat) when no workspace is open by centralizing “folder repository manager” resolution. Instead of assuming a workspace-backed RepositoriesManager.folderManagers[0] exists, it lazily creates (and reuses) a remote-only FolderRepositoryManager so webviews can be opened reliably in “no workspace” scenarios.

Changes:

• Introduces FolderRepositoryManagerResolver to return an existing workspace manager when available, or lazily create/reuse a remote-only manager otherwise.
• Routes both UriHandler (vscode:// extension URIs) and ExternalUriOpener (https:// links) through the shared resolver to avoid undefined managers and duplicate remote-only instances.
• Adds/updates tests to cover the “no workspace open” behavior for both URI handling and external URI opening.

File summaries

File	Description
src/uriHandler.ts	Uses the shared resolver to obtain a valid manager when opening issue/PR overview webviews via extension URIs.
src/github/externalUriOpener.ts	Replaces ad-hoc remote-only manager creation with the shared resolver for opening GitHub links externally.
src/github/overviewRestorer.ts	Wires the external URI opener registration through the new resolver.
src/github/folderRepositoryManagerResolver.ts	New shared resolver that returns an existing manager or creates/reuses a remote-only FolderRepositoryManager.
src/extension.ts	Instantiates and disposes the resolver via context.subscriptions, then injects it into OverviewRestorer and UriHandler.
src/test/uriHandler.test.ts	New test validating PR link opening uses a remote-only manager when no workspace is open.
src/test/github/externalUriOpener.test.ts	Updates test wiring to use/dispose the resolver and validates remote-only behavior remains correct.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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