[OpenStreetMap] #4947: Clicking "Hide areas" on the data panel breaks the slippy map ending up at NaN coordinates

[OpenStreetMap]

#4947: Clicking "Hide areas" on the data panel breaks the slippy map ending up at
NaN coordinates
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 Reporter:  Deanna Earley  |      Owner:  rails-dev@…
     Type:  defect         |     Status:  new
 Priority:  minor          |  Milestone:
Component:  website        |    Version:
 Keywords:  data nan       |
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 Looking at some data around Botley
 (http://www.openstreetmap.org/#map=18/50.91446/-1.27131&layers=N) I zoomed
 in, enabled the data panel, clicked "Hide areas", after which, the vector
 data wouldn't be shown, any attempt to zoom failed, and on a refresh, the
 map view stayed blank.
 The cookie had a coordinate of NaN stored.
 To recover, I had to use the "current location" button.

 This was reproducible 3 times in a row on IE9 on Windows 7, but does not
 occur on IE10 on Windows 8.

 I'll confirm again and get exact step when I'm next on that machine.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4947>
OpenStreetMap <http://www.openstreetmap.org/>
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