1. Go to 'Configuration Editor / Edit task filter' page.
2. Add "appName" filter to the list.
Steps to reproduce:
1. Navigate to "Process Cloud" page in Demoshell.
2. Select an app: 'simple-app'
3. Select 'Task Filters' and open the 'Customize your filter' section.
4. Check the list of applications in 'appName' dropdown.
5. Select other filter from the saved ones.
6. Check the list of applications in 'appName' dropdown again.
The list of applications is duplicated after selecting the second filter.
The number is increased each time you change the filter.
The list of applications should be the one received from backend.