Get correct container for inline chat overflow widgets (microsoft#235354)

Fixes microsoft#235353

Author: mjbvz

src/vs/workbench/contrib/inlineChat/browser/inlineChatWidget.ts

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { $, Dimension, getActiveElement, getTotalHeight, h, reset, trackFocus } from '../../../../base/browser/dom.js';
+import { $, Dimension, getActiveElement, getTotalHeight, getWindow, h, reset, trackFocus } from '../../../../base/browser/dom.js';
 import { IActionViewItemOptions } from '../../../../base/browser/ui/actionbar/actionViewItems.js';
 import { getDefaultHoverDelegate } from '../../../../base/browser/ui/hover/hoverDelegateFactory.js';
 import { renderLabelWithIcons } from '../../../../base/browser/ui/iconLabel/iconLabels.js';
@@ -520,7 +520,7 @@ export class EditorBasedInlineChatWidget extends InlineChatWidget {
 		@IHoverService hoverService: IHoverService,
 		@ILayoutService layoutService: ILayoutService
 	) {
-		const overflowWidgetsNode = layoutService.mainContainer.appendChild($('.inline-chat-overflow.monaco-editor'));
+		const overflowWidgetsNode = layoutService.getContainer(getWindow(_parentEditor.getContainerDomNode())).appendChild($('.inline-chat-overflow.monaco-editor'));
 		super(location, {
 			...options,
 			chatWidgetViewOptions: {

src/vs/workbench/test/browser/workbenchTestServices.ts

@@ -642,7 +642,7 @@ export class TestLayoutService implements IWorkbenchLayoutService {
 	hasMainWindowBorder(): boolean { return false; }
 	getMainWindowBorderRadius(): string | undefined { return undefined; }
 	isVisible(_part: Parts): boolean { return true; }
-	getContainer(): HTMLElement { return null!; }
+	getContainer(): HTMLElement { return mainWindow.document.body; }
 	whenContainerStylesLoaded() { return undefined; }
 	isTitleBarHidden(): boolean { return false; }
 	isStatusBarHidden(): boolean { return false; }