Fix drag & drop overlay not appearing on firefox (#1721)

diff --git a/app/assets/javascripts/components/features/ui/index.jsx b/app/assets/javascripts/components/features/ui/index.jsx
index 89fb82568fcafa574fa8a8381325f5195e971333..5c7cc6ef4e6bafa1b3f998e0b0e86e7ffd6ba179 100644 (file)
--- a/app/assets/javascripts/components/features/ui/index.jsx
+++ b/app/assets/javascripts/components/features/ui/index.jsx
@@ -47,7 +47,7 @@ const UI = React.createClass({
       this.dragTargets.push(e.target);
     }
 
-    if (e.dataTransfer && e.dataTransfer.files.length > 0) {
+    if (e.dataTransfer && e.dataTransfer.items.length > 0) {
       this.setState({ draggingOver: true });
     }
   },