Fix dragging and dropping in the presence of jQuery 3.0 #2005
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Drag and drop relied on jQuery's .size() method, which was deprecated in jQuery 1.8 and removed in 3.0.
The method works in Shiny's version of jQuery, 1.12.4. However, the feature breaks when htmlwidgets introduce jQuery >= 3.0, as happened in #1962.
This fix uses
.length
instead of.size
and should make DnD more resilient in the presence of newer versions of jQuery.