Address issue #147

Author: evilaliv3

src/flow.js

@@ -578,10 +578,7 @@
     addFiles: function (fileList, event) {
       var files = [];
       each(fileList, function (file) {
-        // Uploading empty file IE10/IE11 hangs indefinitely
-        // see https://connect.microsoft.com/IE/feedback/details/813443/uploading-empty-file-ie10-ie11-hangs-indefinitely
-        // Directories have size `0` and name `.`
-        // Ignore already added files if opts.allowDuplicateUploads is set to false
+        // https://github.com/flowjs/flow.js/issues/55
         if ((!ie10plus || ie10plus && file.size > 0) && !(file.size % 4096 === 0 && (file.name === '.' || file.fileName === '.')) &&
           (this.opts.allowDuplicateUploads || !this.getFromUniqueIdentifier(this.generateUniqueIdentifier(file)))) {
           var f = new FlowFile(this, file);

test/uploadSpec.js

@@ -364,17 +364,24 @@ describe('upload file', function() {
     flow.on('fileSuccess', success);
 
     flow.addFile(new Blob([]));
-    var file = flow.files[0];
-    flow.upload();
-    expect(requests.length).toBe(1);
-    expect(file.progress()).toBe(0);
-    requests[0].respond(200);
-    expect(requests.length).toBe(1);
-    expect(error).not.toHaveBeenCalled();
-    expect(success).toHaveBeenCalled();
-    expect(file.progress()).toBe(1);
-    expect(file.isUploading()).toBe(false);
-    expect(file.isComplete()).toBe(true);
+
+    // https://github.com/flowjs/flow.js/issues/55
+    if (window.navigator.msPointerEnabled) {
+      expect(flow.files.length, 0);
+    } else {
+      expect(flow.files.length, 1);
+      var file = flow.files[0];
+      flow.upload();
+      expect(requests.length).toBe(1);
+      expect(file.progress()).toBe(0);
+      requests[0].respond(200);
+      expect(requests.length).toBe(1);
+      expect(error).not.toHaveBeenCalled();
+      expect(success).toHaveBeenCalled();
+      expect(file.progress()).toBe(1);
+      expect(file.isUploading()).toBe(false);
+      expect(file.isComplete()).toBe(true);
+    }
   });
 
   it('should not upload folder', function () {