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5489: Clarify initializationOptions r=matklad a=kjeremy



Co-authored-by: Jeremy Kolb <kjeremy@gmail.com>
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@ -11,11 +11,13 @@ If you want to be notified about the changes to this document, subscribe to [#46
## `initializationOptions`
As `initializationOptions`, `rust-analyzer` expects `"rust-analyzer"` section of the configuration.
For `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.
If a language client does not know about `rust-analyzer`'s configuration options it can get sensible defaults by doing any of the following:
* Not sending `initializationOptions`
* Send `"initializationOptions": null`
* Send `"initializationOptions": {}`
## Snippet `TextEdit`