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

src/vs/css.ts

@@ -0,0 +1,81 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+interface ICSSPluginConfig {
+	disabled?: boolean;
+}
+
+/**
+ * Invoked by the loader at run-time
+ */
+export function load(name: string, req: AMDLoader.IRelativeRequire, load: AMDLoader.IPluginLoadCallback, config: AMDLoader.IConfigurationOptions | { isBuild?: boolean }): void { // {{SQL CARBON EDIT}} Added type to config
+	config = config || {};
+	const cssConfig = <ICSSPluginConfig>(config['vs/css'] || {});
+
+	if (cssConfig.disabled) {
+		// the plugin is asked to not create any style sheets
+		load({});
+		return;
+	}
+
+	const cssUrl = req.toUrl(name + '.css');
+	loadCSS(name, cssUrl, () => {
+		load({});
+	}, (err: any) => {
+		if (typeof load.error === 'function') {
+			load.error('Could not find ' + cssUrl + '.');
+		}
+	});
+}
+
+function loadCSS(name: string, cssUrl: string, callback: () => void, errorback: (err: any) => void): void {
+	if (linkTagExists(name, cssUrl)) {
+		callback();
+		return;
+	}
+	createLinkTag(name, cssUrl, callback, errorback);
+}
+
+function linkTagExists(name: string, cssUrl: string): boolean {
+	const links = document.getElementsByTagName('link');
+	for (let i = 0, len = links.length; i < len; i++) {
+		const nameAttr = links[i].getAttribute('data-name');
+		const hrefAttr = links[i].getAttribute('href');
+		if (nameAttr === name || hrefAttr === cssUrl) {
+			return true;
+		}
+	}
+	return false;
+}
+
+function createLinkTag(name: string, cssUrl: string, callback: () => void, errorback: (err: any) => void): void {
+	const linkNode = document.createElement('link');
+	linkNode.setAttribute('rel', 'stylesheet');
+	linkNode.setAttribute('type', 'text/css');
+	linkNode.setAttribute('data-name', name);
+
+	attachListeners(name, linkNode, callback, errorback);
+	linkNode.setAttribute('href', cssUrl);
+
+	const head = document.head || document.getElementsByTagName('head')[0];
+	head.appendChild(linkNode);
+}
+
+function attachListeners(name: string, linkNode: HTMLLinkElement, callback: () => void, errorback: (err: any) => void): void {
+	const unbind = () => {
+		linkNode.removeEventListener('load', loadEventListener);
+		linkNode.removeEventListener('error', errorEventListener);
+	};
+	const loadEventListener = (e: any) => {
+		unbind();
+		callback();
+	};
+	const errorEventListener = (e: any) => {
+		unbind();
+		errorback(e);
+	};
+	linkNode.addEventListener('load', loadEventListener);
+	linkNode.addEventListener('error', errorEventListener);
+}