3c89945e78
Support DidChangeWorkspaceFolders notifications This PR enables the `WorkspaceFoldersServerCapabilities` capability for rust-analyzer and implemented support for the associated [`DidChangeWorkspaceFolders`](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workspace_didChangeWorkspaceFolders) notification to allow clients to update the list of `workspaceFolders` sent during initialization. ## Motivation This allows clients which lazily autodiscover their workspace roots (like the [helix editor](https://github.com/helix-editor/helix) once [my PR](https://github.com/helix-editor/helix/pull/5748) lands) avoid spawning multiple instances of RA. Right now such clients are forced to either: * greedily discover all LSP roots in the workspace (precludes the ability to respond to new workspace roots) * spawn multiple instance of rust-analyzer (one for each root) * restart rust-analyzer whenever a new workspace is added Some example use-cases are shown [here](https://github.com/helix-editor/helix/pull/5748#issuecomment-1421012523). This PR will also improve support for VSCode (and Atom) multi workspaces. ## Implementation The implementation was fairly straightforward as `rust-analyzer` already supports dynamically reloading workspaces, for example on configuration changes. Furthermore, rust-analyzer also already supports auto-discovering internal workspace from the `workspaceFolders` key in the initialization request. Therefore, the necessary logic just needed to be moved to a central place and reused.
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
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