Hello!
When working with datasets, it is handy for a user to both select and
deselect arbitary rows/columns by clicking labels with Control
pressed. As I can see, wxGrid "out of box" doesn't deselect, that is
annoying.
This patch adds missing functionality.
Also something should be done to support range (de)selection by
left-dragging with Control pressed, but I don't understand how :(
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Best regards,
J.F.