src/vs/workbench/browser/parts/panel/panelPart.ts/BasePanelPart/layoutEmptyMessage
class BasePanelPart:	private layoutEmptyMessage(): void {
		if (this.emptyPanelMessageElement) {
			this.emptyPanelMessageElement.classList.toggle('visible', this.compositeBar.getVisibleComposites().length === 0);
		}
	}