Code: support the new deprecated tag

[lnicola]

https://code.visualstudio.com/updates/v1_37#_diagnosticstagdeprecated

[DJMcNab]

This is not supported in the protocol - see microsoft/language-server-protocol#500. So this is currently waiting on upstream.

[lnicola]

See also https://code.visualstudio.com/updates/v1_38#_deprecation-tags-for-symbols-and-completions.

[kjeremy]

We already fill in the deprecated field on the LPS's SymbolInformation. I'm assuming the proposed extension API uses that?

[lnicola]

vscode.languages.registerCompletionItemProvider('plaintext', {
  provideCompletionItems() {
    const item = new vscode.CompletionItem("deprecated_completion");
    item.tags = [vscode.CompletionItemTag.Deprecated];
    return [item];
  }
});

[kjeremy]

Yep but that's in a custom completion provider. If it's handled in the LSP spec then we don't have to make a custom provider.

…

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