[Reg: 6.4 > 6.5] On some non-KDE systems, the mouse cursor doesn't change to indicate resize interaction

#include <QApplication>
#include <QPlainTextEdit>
#include <QTreeView>
#include <QSplitter>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget parent;
    QSplitter splitter(&parent);
    splitter.addWidget(new QTreeView(&parent));
    splitter.addWidget(new QPlainTextEdit(&parent));
    splitter.setHandleWidth(1);
    parent.resize(300, 200);
    parent.show();
    return a.exec();
}