[openstreetmap/openstreetmap-website] The map on the iMac Retina 4K is not clear (#1623)

[Tom Hughes]

So there are actually two different things you can do - you can add `{r}` to the URL template which will expand as `@2x` on hidpi displays, so that is what we need to do for @gravitystorm's layers.

You can also set `detectRetina: true` on a layer, which will cause it to fetch four tiles from the next higher zoom. That doesn't work very well though as you wind up with very thin roads and small text.

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