Vendor codespan, and fix character offset issues #1793
Merged
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The original motivation here was that I wanted to update
lsp_types
but was blocked bycodespan_lsp
's dependency on an old version.codespan_lsp
seems to be abandoned (along with the rest of codespan). Since it's only a few utility functions, the easiest thing was to vendor it.While I was doing that, I noticed that we aren't correctly converting byte positions to lsp positions in some of our responses, so I fixed that.