Create an object representing double-click options
dblclickOpts(id = NULL, clip = TRUE, delay = 400)
||Input value name. For example, if the value is
"plot_dblclick", then the click coordinates will be available as
||Should the click area be clipped to the plotting area? If FALSE,
then the server will receive double-click events even when the mouse is
outside the plotting area, as long as it is still inside the image.
||Maximum delay (in ms) between a pair clicks for them to be
counted as a double-click.
This generates an object representing dobule-click options, to be passed as
dblclick argument of