Drag from the handle at the bottom right of the selected range to fill the dragged-over area with the values
from the selected range
Drag-fill can be done in any direction
Drag-fill selection border (css) is different to regular selection (uses copyToSelectionCss
from CellRangeDecorator rather than the usual selectionCss)
Customize drag-fill code logic to copy dragged cells by subscribing to onDragReplaceCells.
Use this event to customise behaviour. The default function is ideal as a starting example.
Also uses hybrid selection model plugin to select a row if the left hand cell (containing row index) is
selected, or select a cell otherwise.
Uses the context menu plugin to display different context menus for the left hand and all other columns.
