Fix matching files when config is not in the workspace root #1412
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In IntelliSense we have this special behavior where if we only detect a single config in a workspace then that config will cover files opened in the entire workspace. We broke this accidentally in v0.14.16 because we made sure document selectors were re-calculated correctly for v4 projects files. With how things are structured/shared this setup is the same for v3 and v4 and we accidentally wiped out the "root" selector we'd add to the project if it was the only one in a given workspace folder.
So this isn't usually a problem but definitely can be if:
This should hopefully fix any project matching issues people have had that broke from v0.14.17 and later.
Fixes #1404 (and maybe #1377)