Right-click in DataView Clears Selection
If a user selects a set of cell sin the dataview table, then right-clicks on the
selection to get a popup menu (e.g. if they are planning to "copy" the
selection) the selection is cleared, and only the cell immediately beneath the
mouse cursor is selected.
I think mouse listener just needs to be changed so it doesn't start a selection
when right button clicked - only when left button clicked