Use language-client providers for Call Hierarchy and Workspace Symbols

[Colen Garoutte-Carson (Colengms)]

The extension manually registered Call Hierarchy and Workspace Symbol providers that used cpptools-specific protocol methods. The native language server now advertises and implements the corresponding standard LSP capabilities for both cpptools and mscppls.

This change:

• Removes the custom Call Hierarchy and Workspace Symbol provider classes.
• Uses vscode-languageclient’s built-in providers and standard LSP requests.
• Preserves Call Hierarchy cancellation, progress UI, telemetry, and file-detail presentation through middleware.
• Preserves localized workspace-symbol scope and suffix presentation using metadata supplied through WorkspaceSymbol.data.
• Moves the quiet Call Hierarchy request helpers out of the Providers directory.
• Moves the Go to Definition helper out of Providers, since it is an internal command helper rather than a registered provider.

No user-facing behavior is intended to change.

Validation:

• npm run compile
• npm run lint
• Companion native desktop and mscppls integration tests pass.

Compatibility:

This PR requires the companion native change. It should ship with a matching cpptools binary that advertises the standard capabilities and no longer exposes the replaced custom methods.

[Copilot]

Copilot review overview

🟡 Changes recommended

Server-initiated incoming-call cancellation no longer records the preserved cancellation telemetry.

Get a fresh assessment by requesting another Copilot review.

Review tier: Balanced
Findings: 1

Open (1)

• Server-initiated cancellation skips the incoming-call telemetry. vscode-languageclient 9.0.1… · New

What changed in this PR

Replaces custom Call Hierarchy and Workspace Symbol providers with standard LSP-backed language-client providers while retaining presentation and telemetry middleware.

Changes:

• Removes custom provider registrations and protocol types.
• Adds standard Call Hierarchy request helpers.
• Preserves symbol localization and Call Hierarchy UI behavior through middleware.

File	Description
workspaceSymbolProvider.ts	Removes the custom workspace-symbol provider.
callHierarchyProvider.ts	Removes the custom Call Hierarchy provider.
protocolFilter.ts	Adds middleware for presentation, cancellation, and telemetry.
goToDefinition.ts	Relocates the definition helper.
extension.ts	Updates helper imports.
client.ts	Removes custom provider registration and protocol declarations.
callHierarchy.ts	Adds standard LSP Call Hierarchy helpers.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[Copilot]

Copilot review overview

🔵 Needs a closer look

Correctness depends on coordinated native-server capabilities and protocol metadata behavior outside this diff.

Review tier: Balanced
Findings: None

Resolved since last review (1)

• Server-initiated cancellation skips the incoming-call telemetry. vscode-languageclient 9.0.1…