Merge from vscode merge-base (#22780)

* Revert "Revert "Merge from vscode merge-base (#22769)" (#22779)"

This reverts commit 47a1745180.

* Fix notebook download task

* Remove done call from extensions-ci

extensions/markdown-language-features/server/src/configuration.ts

@@ -0,0 +1,59 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Connection, Emitter } from 'vscode-languageserver';
+import { Disposable } from './util/dispose';
+
+export type ValidateEnabled = 'ignore' | 'warning' | 'error';
+
+interface Settings {
+	readonly markdown: {
+		readonly suggest: {
+			readonly paths: {
+				readonly enabled: boolean;
+			};
+		};
+
+		readonly experimental: {
+			readonly validate: {
+				readonly enabled: true;
+				readonly referenceLinks: {
+					readonly enabled: ValidateEnabled;
+				};
+				readonly fragmentLinks: {
+					readonly enabled: ValidateEnabled;
+				};
+				readonly fileLinks: {
+					readonly enabled: ValidateEnabled;
+					readonly markdownFragmentLinks: ValidateEnabled;
+				};
+				readonly ignoreLinks: readonly string[];
+			};
+		};
+	};
+}
+
+
+export class ConfigurationManager extends Disposable {
+
+	private readonly _onDidChangeConfiguration = this._register(new Emitter<Settings>());
+	public readonly onDidChangeConfiguration = this._onDidChangeConfiguration.event;
+
+	private _settings?: Settings;
+
+	constructor(connection: Connection) {
+		super();
+
+		// The settings have changed. Is send on server activation as well.
+		this._register(connection.onDidChangeConfiguration((change) => {
+			this._settings = change.settings;
+			this._onDidChangeConfiguration.fire(this._settings!);
+		}));
+	}
+
+	public getSettings(): Settings | undefined {
+		return this._settings;
+	}
+}