[Pidgin] #12599: It's impossible to override TAB key autocompletion behaviour in plugin

[Pidgin]

#12599: It's impossible to override TAB key autocompletion behaviour in plugin
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Reporter:  kawaii.neko  |        Type:  defect          
  Status:  new          |   Component:  pidgin (gtk)    
 Version:  2.7.3        |    Keywords:  tab autocomplete
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 The reason is very simple: key-press-event handler for gtkconv->entry in
 multi user chat always return TRUE when Tab key is pressed. So even when
 text entry is empty, for MUC's key event won't be passed to plugin because
 tab_complete function returns TRUE in this case.
 It is also not an option to use key-release-event because in this case
 plugin handler will be invoked after pidgin's core tab_complete function.

 This bug blocks, for example ticket #9748

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Ticket URL: <http://developer.pidgin.im/ticket/12599>
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