src/vs/base/browser/ui/button/button.ts/ButtonWithDescription/setHoverBackground
class ButtonWithDescription:	private setHoverBackground(): void {
		let hoverBackground;
		if (this.options.secondary) {
			hoverBackground = this.buttonSecondaryHoverBackground ? this.buttonSecondaryHoverBackground.toString() : null;
		} else {
			hoverBackground = this.buttonHoverBackground ? this.buttonHoverBackground.toString() : null;
		}
		if (hoverBackground) {
			this._element.style.backgroundColor = hoverBackground;
		}
	}