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4688: Document initilizationOptions used by rust-analyzer r=matklad a=matklad



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Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
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docs/dev/lsp-extensions.md
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@ -7,6 +7,16 @@ All capabilities are enabled via `experimental` field of `ClientCapabilities` or
Requests which we hope to upstream live under `experimental/` namespace.
Requests, which are likely to always remain specific to `rust-analyzer` are under `rust-analyzer/` namespace.
If you want to be notified about the changes to this document, subscribe to [#4604](https://github.com/rust-analyzer/rust-analyzer/issues/4604).
## `initializationOptions`
As `initializationOptions`, `rust-analyzer` expects `"rust-analyzer"` section of the configuration.
That is, `rust-analyzer` usually sends `"workspace/configuration"` request with `{ "items": ["rust-analyzer"] }` payload.
`initializationOptions` should contain the same data that would be in the first item of the result.
It's OK to not send anything, then all the settings would take their default values.
However, some settings can not be changed after startup at the moment.
## Snippet `TextEdit`
**Issue:** https://github.com/microsoft/language-server-protocol/issues/724