Steps to reproduce:
Search for a keyword using the search EditText.
Click any question from the search result. This will open the question.
Press the back button to go back to the previous screen.
Use the pull to refresh feature: this loads questions without taking the search terms into consideration. Though the terms are still present in the EditText.
When the search yields results that do not fill the ListView, upon going back (step 3) a ProgressBar will be shown below the results indicating new content is loading. Yet nothing really is.
Example: search for android-app search cleared. You should get 2 results.