[Tickets #13541] Strange and annoying dynamic view mail list error

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Ticket URL: https://bugs.horde.org/ticket/13541
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  Ticket             | 13541
  Created By         | azurit at pobox.sk
  Summary            | Strange and annoying dynamic view mail list error
  Queue              | IMP
  Version            | 6.2.1
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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azurit at pobox.sk (2014-09-04 15:42) wrote:

Sometimes, randomly, i'm experiencing strange behavior on folder list  
page (it happened only for INBOX so far but it's probably because it's  
opened all the time). All messages, except few (random count), simply  
disappears. I can see that new e-mails count is correctly updating in  
favicon but e-mail list is still the same - only those few messages.  
The only way how to fix it is to do CTRL + F5 (i tried to open other  
folder and then inbox again, clicking on Refresh button and so on). I  
can see this in web console:

Error: TypeError: this.data.get(...) is undefined
File: /imp/js/viewport.js?v=77c7e43e
Line: 1518

Unfortunately i don't know how to reproduce it, it's happening randomly.

Firefox 32 but it was happening also on 31. Problem start to appearing  
after upgrade from 6.1 to 6.2.

Any hints how to debug it?