contextvars.copy_context() is called for every message including notifications

[meymchen]

Component

pygls/protocol/json_rpc.py

Summary

handle_message copies the entire context variables mapping for every single JSON-RPC message. High-frequency notifications such as textDocument/didChange do not need this isolation because they have no message ID and cannot be correlated.

Steps to Reproduce

1. Rapidly type in an editor connected to a pygls server.
2. Observe CPU overhead from contextvars.copy_context in profiles.

Expected Behavior

Context isolation should only be performed for requests that need ID correlation.

Actual Behavior

Every notification pays the copy cost.

Affected Code (pygls/protocol/json_rpc.py, ~L501)

ctx = contextvars.copy_context()

Proposed Fix

Only create the copied context inside the RPCRequest branch; call notification and response handlers directly.