The WINDOW_BUFFER_SIZE_RECORD structure is used in a console INPUT_RECORD structure to report changes in the size of the screen buffer.
typedef struct _WINDOW_BUFFER_SIZE_RECORD { // wbsr 
    COORD dwSize; 
} WINDOW_BUFFER_SIZE_RECORD; 
 
Buffer size events are placed in the input buffer when the console is in window-aware mode (ENABLE_WINDOW_INPUT).