src/vs/workbench/browser/parts/editor/editorGroupView.ts/EditorGroupView/createContainerToolbar
class EditorGroupView:	private createContainerToolbar(): void {

		// Toolbar Container
		const toolbarContainer = document.createElement('div');
		toolbarContainer.classList.add('editor-group-container-toolbar');
		this.element.appendChild(toolbarContainer);

		// Toolbar
		const containerToolbar = this._register(new ActionBar(toolbarContainer, {
			ariaLabel: localize('ariaLabelGroupActions', "Empty editor group actions")
		}));

		// Toolbar actions
		const containerToolbarMenu = this._register(this.menuService.createMenu(MenuId.EmptyEditorGroup, this.scopedContextKeyService));
		const updateContainerToolbar = () => {
			const actions: { primary: IAction[]; secondary: IAction[] } = { primary: [], secondary: [] };

			// Clear old actions
			this.containerToolBarMenuDisposable.value = toDisposable(() => containerToolbar.clear());

			// Create new actions
			createAndFillInActionBarActions(
				containerToolbarMenu,
				{ arg: { groupId: this.id }, shouldForwardArgs: true },
				actions,
				'navigation'
			);

			for (const action of [...actions.primary, ...actions.secondary]) {
				const keybinding = this.keybindingService.lookupKeybinding(action.id);
				containerToolbar.push(action, { icon: true, label: false, keybinding: keybinding?.getLabel() });
			}
		};
		updateContainerToolbar();
		this._register(containerToolbarMenu.onDidChange(updateContainerToolbar));
	}