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fix crash when pressing Down in command buffer and the history is empty
(reported by John McCabe-Dansted's monkey test) git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@30107 a592a061-630c-0410-9148-cb99ea01b6c8
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@ -248,7 +248,8 @@ void GuiCommandBuffer::down()
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if (!h.empty())
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edit_->setText(toqstr(h));
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downPB->setEnabled(history_pos_ != history_.end()-1);
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downPB->setEnabled(!history_.empty()
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&& history_pos_ != history_.end() - 1);
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upPB->setEnabled(history_pos_ != history_.begin());
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}
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