src/vs/workbench/browser/parts/views/treeView.ts/TreeView/showMessage
class TreeView:	private showMessage(message: string): void {
		this.messageElement.classList.remove('hide');
		this.resetMessageElement();
		this._messageValue = message;
		if (!isFalsyOrWhitespace(this._message)) {
			this.messageElement.textContent = this._messageValue;
		}
		this.layout(this._height, this._width);
	}