- borderReg += QRect(0, 0, fw, height()); //left
- borderReg += QRect(width() - fw, 0, fw, height()); //right
- borderReg += QRect(0, 0, width(), fw); //top
- borderReg += QRect(0, height() - fw, width(), fw); //bottom
+ borderReg += QRegion(QRect(0, 0, fw, height())); //left
+ borderReg += QRegion(QRect(width() - fw, 0, fw, height())); //right
+ borderReg += QRegion(QRect(0, 0, width(), fw)); //top
+ borderReg += QRegion(QRect(0, height() - fw, width(), fw)); //bottom