[openstreetmap/openstreetmap-website] Disabling asynchronous Map data layer rendering (PR #5877)

[Nenad Vujicic]

nenad-vujicic left a comment (openstreetmap/openstreetmap-website#5877)

I also succeeded to reproduce flickering by switching between e.g. point [A](https://www.openstreetmap.org/#map=18/59.924360/30.304869&layers=ND) and point [B](https://www.openstreetmap.org/#map=18/59.925492/30.305593&layers=ND), although I have high-performance machine (by e.g. pressing Back and Forward).

Wouldn't be better approach to replace [clearLayers](https://github.com/openstreetmap/openstreetmap-website/blob/2075eb8329e5e011e8acaa90ade8229f6c9ea88b/app/assets/javascripts/index/layers/data.js#L112) + [rebuilding data layer](https://github.com/openstreetmap/openstreetmap-website/blob/2075eb8329e5e011e8acaa90ade8229f6c9ea88b/app/assets/javascripts/index/layers/data.js#L80) (which is actually causing the flickering, if I understood it well) with `remove out-of-viewport features and add new-features` logic?

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