title: Input file selection event not firing when selecting the same file in KnockoutJS and HTML
body: <p>Probably this has a easy solution for JQuery but i am struggling to do with KnckoutJS.
  When i select the same file then event is not firing.<br>
  I have a html like this    </p>
  
  <pre><code>                    &lt;label class="upload"&gt;
                          &lt;input id="documentattachment" name="documentattachment" multiple type="file" data-bind="event: { change: function() { uploadSelected($element.files) } }" /&gt;
                          {{texts().attachmentFile}}
                      &lt;/label&gt;
  </code></pre>
  
  <p>and in viewmodel i have code like this.    </p>
  
  <pre><code>function uploadSelected(file) {
  
              if (!vm.uploadOnSubmit()) {
                  if (!session.hasPermission(session.permissions.Documents, vm.clientNr())) {
                      toastr.error(vm.texts().permissionDenied);
                      return false;
                  } else {
                      var att = new Attachment(
                          file[0].lastModifiedDate,
                          file[0].name,
                          0,
                          (vm.uploadOnSubmit() ? true : false));
                      vm.attachments.push(att);
                      vm.fileDatas.push(file[0]);
                      return true;
                  }
              } 
          }
  </code></pre>
  
  <p>my question is that how can get file even i select the same file.<br>
  Thanks</p>