[Kde-bindings] QtRuby crash at find_child

[David Palacio]

This is a little testcase based on a working code (on 4.2.0).  Change TEST_KDE 
to true to get the crash.

# Source code for testcase

require 'korundum4'

about = KDE::AboutData.new(
'irb_kapp', 'irb_kapp',
KDE.ki18n( 'IRB KApp' ), '1.8.7',
KDE.ki18n( 'Kuick IRB Application' ),
KDE::AboutData::License_GPL_V3,
KDE.ki18n( '(c) 2009 Null' ) )
KDE::CmdLineArgs.init(ARGV, about)
KDE::Application.new

#Switch test
TEST_KDE = false

w = TEST_KDE ? KDE::MainWindow.new : Qt::Widget.new
offers = KDE::ServiceTypeTrader.self.query 'KParts/ReadOnlyPart', "(Library == 
'okularpart')"
factory = KDE::PluginLoader.new(offers[0].library).factory
part = factory.create('KParts::ReadOnlyPart', w, nil, [], '')
pageview = w.find_child( Qt::Object, 'okular::pageView')
puts pageview.inspect

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