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

[Roman Deev]

Full discussion here: https://github.com/openstreetmap/openstreetmap-website/pull/5009#issuecomment-2722980833 But I'll duplicate the comment here.

https://github.com/openstreetmap/openstreetmap-website/pull/5009 brought two problems:

1. When moving the map, a white flash occurs and all objects on the map are redrawn:

https://github.com/user-attachments/assets/3c87c769-174c-4513-a5be-115eb9517bb8

2. Rendering slowed down. What used to occupy ~400ms now occupies ~1.3s. Hiding a data layer was previously performed on ~100ms, now ~1.5s (!)

Both problems arise due to the fact that before that the redrawing of the map was performed only once, after the completion of the removal/adding of objects to the SVG-element of the map.

--

This PR only removes asynchronous rendering. The loader that shows downloading data near the checkbox remains.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5877

-- Commit Summary --

  * Disabling asynchronous data layer rendering

-- File Changes --

    M app/assets/javascripts/leaflet.map.js (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5877.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5877.diff

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