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Show window contents while dragging

If you see the Microsoft Plus! you should notice the "Show window contents while dragging", you can use this option from your program by calling the API function:

SystemParametersInfo
To Show window contents while dragging:
SystemParametersInfo (SPI_SETDRAGFULLWINDOWS, 1, nil, 0);
To disable this option call the function:
SystemParametersInfo (SPI_SETDRAGFULLWINDOWS, 1, nil, 0);

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