Rust Analyzer + Copilot results in a warning: different client offset_encodings detected for buffer ...

[laureanray]

I'm constantly getting this warning
warning: multiple different client offset_encodings detected for buffer, this is not supported yet

I did a little investigation and it seems that some folks already experienced this with clangd + other client attached to the buffer.

Basing on this discussion, neovim/nvim-lspconfig#2184 (comment) it does seem like this is happening when you have multiple clients attached to the buffer with different offset_encoding. In my case it's the rust-analyzer which uses UTF-8 and Copilot uses UTF-16.

I assumed that this can be resolved by updating the capabilities.offsetEncoding in my LSP configuration. I tried doing so and have set it to the following values:

-- Tried all of the following
capabilities.offsetEncoding = {'utf-8'}
capabilities.offsetEncoding = 'utf-8'
capabilities.offsetEncoding = {'utf-16'}
capabilities.offsetEncoding = 'utf-16'

This just results rust-analyzer to quit. With the following log:

[WARN][2023-06-23 00:08:31] ...lsp/handlers.lua:145	"The language server copilot triggers a registerCapability handler for workspace/didChangeWorkspaceFolders despite dynamicRegistration set to false. Report upstream, this warning is harmless"
[ERROR][2023-06-23 00:08:32] .../vim/lsp/rpc.lua:734	"rpc"	"/Users/laureanray.bahala/.local/share/nvim/mason/bin/rust-analyzer"	"stderr"	'[ERROR rust_analyzer] Unexpected error: Failed to deserialize InitializeParams: invalid type: string "utf-8", expected a sequence; {"processId":86001,"clientInfo":{"name":"Neovim","version":"0.10.0"},"rootPath":"/Users/laureanray.bahala/Projects/learning-rust/hashmaps","trace":"off","rootUri":"file:///Users/laureanray.bahala/Projects/learning-rust/hashmaps","initializationOptions":{},"capabilities":{"offsetEncoding":"utf-8","window":{"workDoneProgress":true,"showDocument":{"support":true},"showMessage":{"messageActionItem":{"additionalPropertiesSupport":false}}},"workspace":{"symbol":{"dynamicRegistration":false,"hierarchicalWorkspaceSymbolSupport":true,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]}},"workspaceFolders":true,"didChangeWatchedFiles":{"dynamicRegistration":true,"relativePatternSupport":true},"semanticTokens":{"refreshSupport":true},"workspaceEdit":{"resourceOperations":["rename","create","delete"]},"configuration":true,"applyEdit":true},"general":{"positionEncodings":["utf-8","utf-16","utf-32"]},"experimental":{"serverStatusNotification":true},"textDocument":{"implementation":{"linkSupport":true},"references":{"dynamicRegistration":false},"documentHighlight":{"dynamicRegistration":false},"documentSymbol":{"dynamicRegistration":false,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"hierarchicalDocumentSymbolSupport":true},"semanticTokens":{"formats":["relative"],"overlappingTokenSupport":true,"multilineTokenSupport":false,"serverCancelSupport":false,"augmentsSyntaxTokens":true,"dynamicRegistration":false,"tokenTypes":["namespace","type","class","enum","interface","struct","typeParameter","parameter","variable","property","enumMember","event","function","method","macro","keyword","modifier","comment","string","number","regexp","operator","decorator"],"requests":{"range":false,"full":{"delta":true}},"tokenModifiers":["declaration","definition","readonly","static","deprecated","abstract","async","modification","documentation","defaultLibrary"]},"codeAction":{"dynamicRegistration":true,"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"isPreferredSupport":true,"dataSupport":true,"resolveSupport":{"properties":["edit"]}},"callHierarchy":{"dynamicRegistration":false},"formatting":{"dynamicRegistration":true},"rangeFormatting":{"dynamicRegistration":true},"rename":{"dynamicRegistration":true,"prepareSupport":true},"hover":{"dynamicRegistration":true,"contentFormat":["markdown","plaintext"]},"definition":{"dynamicRegistration":true,"linkSupport":true},"publishDiagnostics":{"relatedInformation":true,"tagSupport":{"valueSet":[1,2]}},"declaration":{"linkSupport":true},"typeDefinition":{"linkSupport":true},"synchronization":{"dynamicRegistration":false,"willSave":true,"didSave":true,"willSaveWaitUntil":true},"signatureHelp":{"dynamicRegistration":false,"signatureInformation":{"activeParameterSupport":true,"parameterInformation":{"labelOffsetSupport":true},"documentationFormat":["markdown","plaintext"]}},"completion":{"dynamicRegistration":false,"insertTextMode":1,"contextSupport":true,"completionItem":{"snippetSupport":true,"commitCharactersSupport":true,"preselectSupport":true,"deprecatedSupport":true,"labelDetailsSupport":true,"tagSupport":{"valueSet":[1]},"documentationFormat":["markdown","plaintext"],"insertReplaceSupport":true,"insertTextModeSupport":{"valueSet":[1,2]},"resolveSupport":{"properties":["documentation","detail","additionalTextEdits"]}},"completionItemKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]},"completionList":{"itemDefaults":["commitCharacters","editRange","insertTextFormat","insertTextMode","data"]}}}},"workspaceFolders":[{"uri":"file:///Users/laureanray.bahala/Projects/learning-rust/hashmaps","name":"/Users/laureanray.bahala/Projects/learning-rust/hashmaps"}]}\nFailed to deserialize InitializeParams: invalid type: string "utf-8", expected a sequence; {"processId":86001,"clientInfo":{"name":"Neovim","version":"0.10.0"},"rootPath":"/Users/laureanray.bahala/Projects/learning-rust/hashmaps","trace":"off","rootUri":"file:///Users/laureanray.bahala/Projects/learning-rust/hashmaps","initializationOptions":{},"capabilities":{"offsetEncoding":"utf-8","window":{"workDoneProgress":true,"showDocument":{"support":true},"showMessage":{"messageActionItem":{"additionalPropertiesSupport":false}}},"workspace":{"symbol":{"dynamicRegistration":false,"hierarchicalWorkspaceSymbolSupport":true,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]}},"workspaceFolders":true,"didChangeWatchedFiles":{"dynamicRegistration":true,"relativePatternSupport":true},"semanticTokens":{"refreshSupport":true},"workspaceEdit":{"resourceOperations":["rename","create","delete"]},"configuration":true,"applyEdit":true},"general":{"positionEncodings":["utf-8","utf-16","utf-32"]},"experimental":{"serverStatusNotification":true},"textDocument":{"implementation":{"linkSupport":true},"references":{"dynamicRegistration":false},"documentHighlight":{"dynamicRegistration":false},"documentSymbol":{"dynamicRegistration":false,"symbolKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]},"hierarchicalDocumentSymbolSupport":true},"semanticTokens":{"formats":["relative"],"overlappingTokenSupport":true,"multilineTokenSupport":false,"serverCancelSupport":false,"augmentsSyntaxTokens":true,"dynamicRegistration":false,"tokenTypes":["namespace","type","class","enum","interface","struct","typeParameter","parameter","variable","property","enumMember","event","function","method","macro","keyword","modifier","comment","string","number","regexp","operator","decorator"],"requests":{"range":false,"full":{"delta":true}},"tokenModifiers":["declaration","definition","readonly","static","deprecated","abstract","async","modification","documentation","defaultLibrary"]},"codeAction":{"dynamicRegistration":true,"codeActionLiteralSupport":{"codeActionKind":{"valueSet":["","quickfix","refactor","refactor.extract","refactor.inline","refactor.rewrite","source","source.organizeImports"]}},"isPreferredSupport":true,"dataSupport":true,"resolveSupport":{"properties":["edit"]}},"callHierarchy":{"dynamicRegistration":false},"formatting":{"dynamicRegistration":true},"rangeFormatting":{"dynamicRegistration":true},"rename":{"dynamicRegistration":true,"prepareSupport":true},"hover":{"dynamicRegistration":true,"contentFormat":["markdown","plaintext"]},"definition":{"dynamicRegistration":true,"linkSupport":true},"publishDiagnostics":{"relatedInformation":true,"tagSupport":{"valueSet":[1,2]}},"declaration":{"linkSupport":true},"typeDefinition":{"linkSupport":true},"synchronization":{"dynamicRegistration":false,"willSave":true,"didSave":true,"willSaveWaitUntil":true},"signatureHelp":{"dynamicRegistration":false,"signatureInformation":{"activeParameterSupport":true,"parameterInformation":{"labelOffsetSupport":true},"documentationFormat":["markdown","plaintext"]}},"completion":{"dynamicRegistration":false,"insertTextMode":1,"contextSupport":true,"completionItem":{"snippetSupport":true,"commitCharactersSupport":true,"preselectSupport":true,"deprecatedSupport":true,"labelDetailsSupport":true,"tagSupport":{"valueSet":[1]},"documentationFormat":["markdown","plaintext"],"insertReplaceSupport":true,"insertTextModeSupport":{"valueSet":[1,2]},"resolveSupport":{"properties":["documentation","detail","additionalTextEdits"]}},"completionItemKind":{"valueSet":[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]},"completionList":{"itemDefaults":["commitCharacters","editRange","insertTextFormat","insertTextMode","data"]}}}},"workspaceFolders":[{"uri":"file:///Users/laureanray.bahala/Projects/learning-rust/hashmaps","name":"/Users/laureanray.bahala/Projects/learning-rust/hashmaps"}]}'

Any ideas?

My last resort is to just inhibit the warning, but I haven't find any resources in doing so.

Any help with be appreciated. Thanks!