preferredPathSeparator does not seem to be respected in #include auto complete

[bobbrow]

Environment

(irrelevant)

Bug Summary and Steps to Reproduce

We have a setting that supposedly controls the slash behavior for #include auto complete:

The setting description states that it is supposed to be the character used for path separators in the auto complete results. However, it doesn't appear that we add any separators for #include auto complete. I thought that we used to, but now it seems the setting is only used for paths returned via the code actions. I believe this setting was intended to cover more than just the #include auto complete case, but for now, I think we need to restore the behavior described in the setting and add separators as part of the #include auto complete feature.

Configuration and Logs

n/a

Other Extensions

No response

Additional context

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