[openstreetmap/openstreetmap-website] Dashboard map under/overzooms map tiles at fractional zoom levels (Issue #6618)

[Paul Norman]

pnorman left a comment (openstreetmap/openstreetmap-website#6618)

> What I’d like to get out of this conversation is whether the current main map (or the dashboard map prior to [#6504](https://github.com/openstreetmap/openstreetmap-website/pull/6504)) steers clear of the concern you’ve raised. If so, then “don’t do it” suggests that we could disable incremental zooming whenever a map shows the Standard layer and reenable incremental zooming whenever it shows the Shortbread or MapTiler OMT layer.

Right now it's don't do it. Any scale other than a tile size of 256 DI pixels will result in the text and symbols appearing too large or too small. Too small is particularly undesirable for OpenStreetMap Carto because it uses fonts on the smaller side. This does **not** cause blurriness. That is caused by displaying tiles as something other than 256 physical pixels, and this blurriness is normal on most devices. It's a limitation of the standard layer and its rendering stack more than OpenStreetMap Carto itself.

When switching from a layer that supports fractional zooms to one that doesn't I would go with rounding to the scale of the closest integer zoom. This results in the least change of scale or area displayed. 

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