[openstreetmap/openstreetmap-website] Incorrect panning direction when clicking History on mobile browser (#1864)

[smaprs]

I guess this is also about what I've wrongly asked in the  
https://github.com/gravitystorm/openstreetmap-carto/issues/3237  
and so I was told to post it here:  
  
Expected behavior

Rendering standard OSM tiles normally on mobile (cellular android) on history mode.

Actual behavior

Renders only some standard OSM tiles, but blank tiles for the rest, on mobile, on history mode:
like in openstreetmap.org/history#map...
They got truncated at half screen more or less.
Also it displaces from the center of where it was.
Also it shows not well the changeset frames in the area, it shows just as a thiny trace, not as an area.
So can't chose a changeset to verify.
It happens only on mobile and on history mode.
When disabled history mode, rendering returns to normal.
Some other fellow mappers have reported same problem.

The picture link above shows it.
Thanks


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