(Having over 10000 files is likely the problem. See this bug report)
That being said, I think the original post is still very valuable. The simplified quick switcher algorithm has some problems:
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Ignores search strings that appeared more than one time.
- So “E cell”, “C cell” cannot be found because “E”、“C” already appeared in “cell” and are thus ignored. “pro project” will also be unretrievable among other "project"s.
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ignores their appearing order.
- In this example, “flexor pollicis longus” ranked behind many files that don’t actually match “fl p lo” in the correct order. (It’s a muscle that moves your thumb, if you are wandering.)