src/vs/editor/contrib/peekView/peekView.ts/PeekViewWidget/_doLayoutHead
class PeekViewWidget:	protected _doLayoutHead(heightInPixel: number, widthInPixel: number): void {
		if (this._headElement) {
			this._headElement.style.height = `${heightInPixel}px`;
			this._headElement.style.lineHeight = this._headElement.style.height;
		}
	}