<map-a href="url"> with a too-long url causes page to become unresponsive on mouseenter

It's calculating the length of the string and it never exits [this while loop](https://github.com/Maps4HTML/Web-Map-Custom-Element/blob/9694e4fbf8fe4731613e419c4d1adbe127577fc9/src/mapml/features/path.js#L126)