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There's no great mystery here, if you look at the internal function that's being called, it contains a TODO explaining that the code is unnecessarily quadratic and needs to be fixed:
https://github.com/zed-industries/zed/blob/12b12ba17a380e321...
So if selecting all matches requires calling this function for each match then I guess it's accidentally cubic?
I also spotted two linear scans before this code (min by key and max by key).
It seems like a combination of the implementation being inefficient even for what it was for (and that this was known), then it was used for something else in a naive way, and the use of a bad abstraction in the code base came at a performance cost.
I don't think this is a case of Rust either demonstrating or failing to demonstrate zero-cost abstractions (at a language level). A language with zero-cost abstractions doesn't promise that any abstraction you write in it is magically going to be free, it just promises that when it makes a choice and abstracts that away from you, it is free (like with dynamic dispatch, or heap allocation, or destructors, or reference counting, etc).
How's it perform at the task at hand: finding all instances of `https://github.com/standardebooks/edgar-allan-poe_poetry/blo...
VS Code cannot be built from sources, and that doesn't seem to have affected it's market share.
> Building VS Code application is proprietary and hence this is not shared, but you can always build your own open source version of VS Code by cloning it.
https://github.com/Microsoft/vscode/issues/18083