[Pidgin] #9117: Change close_immediate preference to not be so confusing

[Pidgin]

#9117: Change close_immediate preference to not be so confusing
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 Reporter:  dlou99        |     Owner:  lschiere
     Type:  patch         |    Status:  new     
Component:  unclassified  |   Version:  2.5.5   
 Keywords:                |  
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 The wording for the close_immediate preference is confusing and ambiguous.
 From reading the description, it is not obvious what this preference does.
 Even if the user gets the idea that conversations are hidden for a while,
 he/she has to guess as to exactly for how long.  This feature is not
 documented anywhere.

 The attached patch makes this preference self-documenting by updating the
 text and changing to a spinbox.

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Ticket URL: <http://developer.pidgin.im/ticket/9117>
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