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88fad4983e
feat: Index workspace symbols at startup rather than on the first symbol search. This will eliminate potential many-second delays when performing the first search, at the price of making cache priming (“Indexing N/M” in the VS Code status bar) take a little longer in total. Hopefully this additional time is insignificant because a typical session will involve at least one symbol search. Further improvement would be to do this as a separate parallel task (which will be beneficial if the workspace contains a small number of large crates), but that would require significant additional refactoring of the progress-reporting mechanism to understand multiple tasks per crate. Happy to tackle that in this PR if desired, but I thought I'd propose the minimal change first.