Refactor rename is slow

[iontodirel]

Environment

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Bug Summary and Steps to Reproduce

Bug Summary:

Steps to reproduce:

1. Open libaprsaroute.zip
2. Go to line 402 in file aprsroute.hpp
3. Invoke Refactor Rename

Refactor Preview takes about 1m to display.

Expected behavior:

Refactor Preview takes 5-10 seconds to display

Configuration and Logs

As this is perf, not sure it will be useful, but I can provide if requested.

Other Extensions

No response

Additional context

No response

[sean-mcmanus]

It would be helpful to know if cpptools/cpptools-srv are in an idle state when the Rename is invoked and what the rename progress UI is showing (or the logging when C_Cpp.loggingLevel is "Debug"). We could also probably get that info ourselves (assuming we can repro the issue).