fix(lsp): handle ShowDocumentParams.external

Problem:
LSP server can't open URLs, because the LSP client does not correctly
handle `ShowDocumentParams.external` requests.
LSP spec: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#showDocumentParams

Solution:
When `ShowDocumentParams.external` is true, open the URL in a web
browser instead of as a editor document.

Author: justinmk3

packages/amazonq/src/lsp/chat/messages.ts

@@ -435,6 +435,21 @@ export function registerMessageListeners(
         async (params: ShowDocumentParams): Promise<ShowDocumentParams | ResponseError<ShowDocumentResult>> => {
             try {
                 const uri = vscode.Uri.parse(params.uri)
+
+                if (params.external) {
+                    // Note: Not using openUrl() because we probably don't want telemetry for these URLs.
+                    // Also it doesn't yet support the required HACK below.
+
+                    // HACK: workaround vscode bug: https://github.com/microsoft/vscode/issues/85930
+                    vscode.env.openExternal(params.uri as any).then(undefined, (e) => {
+                        // TODO: getLogger('?').error('failed vscode.env.openExternal: %O', e)
+                        vscode.env.openExternal(uri).then(undefined, (e) => {
+                            // TODO: getLogger('?').error('failed vscode.env.openExternal: %O', e)
+                        })
+                    })
+                    return params
+                }
+
                 const doc = await vscode.workspace.openTextDocument(uri)
                 await vscode.window.showTextDocument(doc, { preview: false })
                 return params