[imp] Drag and Drop attachment and logout with expired session

[Mantas Gegužis]

> Hello:
>
> When I drag and drop a file to "Add Attachment" I get logged out of  
> horde with the msg:
>
> "Your session has expired. Please login again."
>
> If I add the attachment by clicking on "Add Attachment", then it works.
>
> Horde 5.1.2
> IMP 6.1.3
>
> I tried on Firefox and Chrome. Same behavior.
>
> Thanks.
> Luis Felipe

Same problem is with Chrome in older releases of
Horde 5.1.1
IMP 6.1.2

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