developer joy easter egg (#312642)

* aquarium?

* address comments and making animations cleaner

* address commentS

* fix disposable leak

* improve overall readability, extracted into service

* address code review comments

* more readability stuff

* better comments, addresssome feedback

Author: justschen

build/lib/i18n.resources.json

@@ -708,6 +708,10 @@
 			"name": "vs/sessions/contrib/welcome",
 			"project": "vscode-sessions"
 		},
+		{
+			"name": "vs/sessions/contrib/aquarium",
+			"project": "vscode-sessions"
+		},
 		{
 			"name": "vs/sessions/contrib/chatDebug",
 			"project": "vscode-sessions"

build/lib/stylelint/vscode-known-variables.json

@@ -959,6 +959,7 @@
 		"--notebook-editor-font-size",
 		"--notebook-editor-font-weight",
 		"--outline-element-color",
+		"--agents-aquarium-strip-index",
 		"--separator-border",
 		"--chat-bar-background",
 		"--chat-tab-active-foreground",

src/vs/sessions/common/contextkeys.ts

@@ -33,6 +33,12 @@ export const SessionsWelcomeVisibleContext = new RawContextKey<boolean>('session
 
 //#endregion
 
+//#region < --- Aquarium --- >
+
+export const SessionsAquariumActiveContext = new RawContextKey<boolean>('sessionsAquariumActive', false, localize('sessionsAquariumActive', "Whether the sessions aquarium overlay is active"));
+
+//#endregion
+
 //#region < --- Editor --- >
 
 export const EditorMaximizedContext = new RawContextKey<boolean>('editorMaximized', false, localize('editorMaximized', "Whether the editor area is maximized"));

src/vs/sessions/contrib/aquarium/browser/aquarium.contribution.ts

@@ -0,0 +1,26 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import './media/aquarium.css';
+import { localize } from '../../../../nls.js';
+import { IConfigurationRegistry, Extensions as ConfigurationExtensions } from '../../../../platform/configuration/common/configurationRegistry.js';
+import { InstantiationType, registerSingleton } from '../../../../platform/instantiation/common/extensions.js';
+import product from '../../../../platform/product/common/product.js';
+import { Registry } from '../../../../platform/registry/common/platform.js';
+import { AquariumService, IAquariumService, SESSIONS_DEVELOPER_JOY_ENABLED_SETTING } from './aquariumOverlay.js';
+
+Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration).registerConfiguration({
+	id: 'sessions',
+	properties: {
+		[SESSIONS_DEVELOPER_JOY_ENABLED_SETTING]: {
+			type: 'boolean',
+			default: product.quality !== 'stable',
+			description: localize('sessions.developerJoy.enabled', "Adds an easter egg to the Agents application."),
+			tags: ['experimental'],
+		},
+	},
+});
+
+registerSingleton(IAquariumService, AquariumService, InstantiationType.Delayed);