Fix multiple file drag-and-drop in dcc.Upload - #3916
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Looking good! I tested on Firefox and Chrome and it works well. Just needs a CHANGELOG entry.
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closes #3671
Fixes a regression introduced in #3464
Fix drag-and-drop of multiple files in
dcc.Upload. Collect allDataTransferItementries before the first async operation to avoid losing items during drag event processing.I'm not sure how to do a test for this, but when I run it locally, this fixes the multiple file drag/drop