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qt'QScrollInProgress (./qt-2.1.0/src/kernel/qapplication_x11.cpp:300)

struct QScrollInProgress {
    static long serial;
    QScrollInProgress( QWidget* w, int x, int y ) :
    id( serial++ ), scrolled_widget( w ), dx( x ), dy( y ) {}
    long id;
    QWidget* scrolled_widget;
    int dx, dy;
};
long QScrollInProgress::serial=0;