nyamatongwe left a comment (geany/geany#4620)

If you are using the Visual C++ runtime then there are known library versioning 
problems.

See, for example, 
https://github.com/actions/runner-images/issues/10004#issuecomment-2156109231 .

> EditView sees the change, but still runs singlethread to defer.

There are multiple gates to pass through before multithreading occurs. You have 
to have a multi-threaded processor - `std::thread::hardware_concurrency()` must 
return more than 1. The line has to be wide enough (>1000 bytes) to make the 
threading overhead worth it.

> why geany doesn't hit the other one

The other `std::future` use is for line wrapping.

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