fix: multidragkey not working as stated in docs #2193
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According to the docs: The multiDragKey is "a custom keyboard key may be designated as having to be down for the user to be able to select multi-drag elements."
At the moment, MultiDrag allows user to select a single element even if
multiDragKeyis not down, if set. With this change,mutliDragKeyhas to be down to select even one element.