[PATCH] KHistoryComboBox --- make konq's location box not fail half the time

[Maksim Orlovich]

Hi...  We currently have a critical bug in trunk where konqueror's combo
does not work half the time (#153568). The reason is that we rely on the
activated() signal from QComboBox as the enter trigger. However, this
signal does not get emitted all the time --- there is a workaround to
simulate it when the combo is in NoInsert mode already --- but
QComboBox::Private::_q_returnPressed() might also not emit it if the box
is full. The attached extends the emulation. I would appreciate review of
that, particularly since I am a bit concerned by the whole
emulation-of-signal thing...

Thanks,
Maks
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