Make it easier to understand that workbench.secondarySideBar.defaultVisibility shows chat (in most cases) (fix #253706) (#253820)

src/vs/workbench/contrib/chat/browser/actions/chatActions.ts

@@ -1113,3 +1113,30 @@ MenuRegistry.appendMenuItem(MenuId.TerminalInstanceContext, {
 	title,
 	when: menuContext
 });
+
+// --- Chat Default Visibility
+
+registerAction2(class ToggleDefaultVisibilityAction extends Action2 {
+	constructor() {
+		super({
+			id: 'workbench.action.chat.toggleDefaultVisibility',
+			title: localize2('chat.toggleDefaultVisibility.label', "Show View by Default"),
+			precondition: ChatContextKeys.panelLocation.isEqualTo(ViewContainerLocation.AuxiliaryBar),
+			toggled: ContextKeyExpr.equals('config.workbench.secondarySideBar.defaultVisibility', 'hidden').negate(),
+			f1: false,
+			menu: {
+				id: MenuId.ViewTitle,
+				when: ContextKeyExpr.equals('view', ChatViewId),
+				order: 0,
+				group: '5_configure'
+			},
+		});
+	}
+
+	async run(accessor: ServicesAccessor) {
+		const configurationService = accessor.get(IConfigurationService);
+
+		const currentValue = configurationService.getValue<'hidden' | 'visibleInWorkspace' | 'visible'>('workbench.secondarySideBar.defaultVisibility');
+		configurationService.updateValue('workbench.secondarySideBar.defaultVisibility', currentValue !== 'hidden' ? 'hidden' : 'visible');
+	}
+});