Agent sessions: consider a better out of the box sidebar experience (fix #284045) (#284053)

Author: bpasero

src/vs/workbench/contrib/chat/browser/chat.contribution.ts

@@ -384,9 +384,9 @@ configurationRegistry.registerConfiguration({
 			enumDescriptions: [
 				nls.localize('chat.viewSessions.orientation.auto', "Automatically determine the orientation based on available space."),
 				nls.localize('chat.viewSessions.orientation.stacked', "Display sessions vertically stacked unless a chat session is visible."),
-				nls.localize('chat.viewSessions.orientation.sideBySide', "Display sessions side by side if space is sufficient.")
+				nls.localize('chat.viewSessions.orientation.sideBySide', "Display sessions side by side if space is sufficient, otherwise stacked.")
 			],
-			default: 'auto',
+			default: 'sideBySide',
 			description: nls.localize('chat.viewSessions.orientation', "Controls the orientation of the chat agent sessions view when it is shown alongside the chat."),
 			tags: ['preview', 'experimental'],
 			experiment: {

src/vs/workbench/contrib/chat/browser/chatViewPane.ts

@@ -676,10 +676,6 @@ export class ChatViewPane extends ViewPane implements IViewWelcomeDelegate {
 			case 'stacked':
 				newSessionsViewerOrientation = AgentSessionsViewerOrientation.Stacked;
 				break;
-			// Side by side
-			case 'sideBySide':
-				newSessionsViewerOrientation = AgentSessionsViewerOrientation.SideBySide;
-				break;
 			// Update orientation based on available width
 			default:
 				newSessionsViewerOrientation = width >= ChatViewPane.SESSIONS_SIDEBAR_VIEW_MIN_WIDTH ? AgentSessionsViewerOrientation.SideBySide : AgentSessionsViewerOrientation.Stacked;