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Description
The Language Server Protocol does specify some languageIds to use according to the language: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocumentItem
Currently, LSP4E requires that those languageIds are set in the contentTypeMapping, but in case they aren't, LSP4E should fail-back to a dummy implementation implementing the spec (ie mapping fileExtension->languageId as described).