src/vs/editor/browser/viewParts/minimap/minimap.ts/MinimapOptions/_getMinimapBackground
class MinimapOptions:	private static _getMinimapBackground(theme: EditorTheme, defaultBackgroundColor: RGBA8): RGBA8 {
		const themeColor = theme.getColor(minimapBackground);
		if (themeColor) {
			return new RGBA8(themeColor.rgba.r, themeColor.rgba.g, themeColor.rgba.b, Math.round(255 * themeColor.rgba.a));
		}
		return defaultBackgroundColor;
	}