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Auto merge of rust-lang#113106 - marcospb19:improve-path-with-extensi…
…on-function, r=thomcc std: remove an allocation in `Path::with_extension` `Path::with_extension` used to reallocate (and copy) paths twice per call, now it does it once, by checking the size of the previous and new extensions it's possible to call `PathBuf::with_capacity` and pass the exact capacity required. This also reduces the memory consumption of the path returned from `Path::with_extension` by using exact capacity instead of using amortized exponential growth.
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