src/vs/workbench/browser/parts/panel/panelPart.ts/BasePanelPart/placeholderViewContainersValue
class BasePanelPart:	private set placeholderViewContainersValue(placeholderViewContainesValue: string) {
		if (this.placeholderViewContainersValue !== placeholderViewContainesValue) {
			this._placeholderViewContainersValue = placeholderViewContainesValue;
			this.setStoredPlaceholderViewContainersValue(placeholderViewContainesValue);
		}
	}