Something like
        
        visibleRows := self container calculateExactVisibleRows.        
        numberOfRows := self dataSource numberOfRows.
        interval := (visibleRows / numberOfRows) asFloat.
        delta := 1/numberOfRows.
        pageDelta := ((visibleRows-1) floor)*delta.
        self verticalScrollBar
                scrollDelta: delta pageDelta: pageDelta;
                interval: interval

pagedelta is still off first time.

Stephan


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