Hide tiny zoos and theme parks

[matthijsmelissen]

This starts showing zoos and theme parks from one zoomlevel before
they are large enough to get a name.

Example of theme parks of the size that will disappear now:

[pnorman]

I'm undecided on this. Using a different threshold for rendering an area vs a label was intentional, but I'm not especially tied to it.

[matthijsmelissen]

The different treshold remains: the area is rendered one zoomlevel earpier.

[kocio-pl]

The different treshold remains: the area is rendered one zoomlevel earpier.

Does it? The code is just more strict on z10-16 and relaxed on z17+, but it was z10 before and you didn't switch to z9 instead. Did I understand you right?

[matthijsmelissen]

I mean that on zoom leveps z10-16, if you zoom in the area will appear one zoom level before the text appears.

[matthijsmelissen]

Thanks for quick review!