[OpenStreetMap] #4893: Ask for confirmation before closing the page when editor is active

[OpenStreetMap]

#4893: Ask for confirmation before closing the page when editor is active
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  Reporter:  Circeus      |      Owner:  rails-dev@…
      Type:  enhancement  |     Status:  closed
  Priority:  minor        |  Milestone:
 Component:  website      |    Version:
Resolution:  invalid      |   Keywords:
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Comment (by TomH):

 I have no idea why you lost them. What I do know is that when I try it I
 both get warned that I have unsaved changes and then, once I OK that, the
 page reloads and I get asked if I want to restore them.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4893#comment:4>
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