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

[Christoph Hormann]

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

> It would be nice if we could support high DPI screens. After all, as of the latest release of OpenStreetMap Carto it was something we supported. We didn't do it perfectly but it certainly was supported. It sounds like the current maintainers might be changing that. 

To clarify on this (and to possibly also recruit contributors :wink:): OpenStreetMap Carto has worked towards supporting higher resolution rendering for more than a decade - relevant early work is, in particular, https://github.com/openstreetmap-carto/openstreetmap-carto/issues/1165.  Another key step was https://github.com/openstreetmap-carto/openstreetmap-carto/pull/3657.  This work was substantially stalled by an ugly Mapnik bug (https://github.com/openstreetmap-carto/openstreetmap-carto/issues/2750), which led to some polygon patterns (in particular wetlands) being the only remaining aspect of the style that does not scale properly on higher resolution renderings (discussed [here](https://github.com/openstreetmap-carto/openstreetmap-carto/issues/2038#issuecomment-586732159)).  There are some other things (in particular very narrow line signatures) that could use some tuning specifically for higher resolution rendering, but that is a fairly perfectionist concern.

It would probably be useful btw. if OSMF operations would clarify if supplying higher resolution OSM-Carto tiles hinges on the lack of worktime (hence volunteers interested in working on this are welcome) or if it is a strategic/economic decision not to (OSMF does not want to put infrastructure into this, even if there were volunteers willing and able to set this up and maintain it).

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