* Deal with recent Qt methods deprecation
* Use std::sort, std::less instead of qSort/qLess
* Use QFontMetrics::horizontalAdvance instead of ::width
* Use qApp->primaryScreen() instead of QDesktopWidget
* use lambas instead of QSignalMapper
* Use QTreeWidgetItem::setForeground instead of ::setTextColor
* Use QDir::setPath instead of operator=(QString)
* Use QList::swapItemsAt instead of ::swap
* fix error
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