Copies cursor data into the window.
Clears the window and fills it with data beginning at the requested
row position until all of the data in the cursor is exhausted
or the window runs out of space.
The filled window uses the same row indices as the original cursor.
For example, if you fill a window starting from row 5 from the cursor,
you can query the contents of row 5 from the window just by asking it
for row 5 because there is a direct correspondence between the row indices
used by the cursor and the window.
The current position of the cursor, as returned by {@link #getPosition},
is not changed by this method.