Removed ability to drag n' drop text; drag n' drop ui no longer appears when non-files are dragged

web/react/utils/utils.jsx

@@ -1276,3 +1276,9 @@ export function fillArray(value, length) {
 
     return arr;
 }
+
+// Checks if a data transfer contains files not text, folders, etc..
+// Slightly modified from http://stackoverflow.com/questions/6848043/how-do-i-detect-a-file-is-being-dragged-rather-than-a-draggable-element-on-my-pa
+export function isFileTransfer(files) {
+    return files.types != null && (files.types.indexOf ? files.types.indexOf('Files') !== -1 : files.types.contains('application/x-moz-file'));
+}