Make it possible to find files like "a_b" using the keyboard search
Review Request #111102 - Created June 18, 2013 and submitted
The problem was that pressing "Shift", which resulted in adding an empty string to the current search, cancels the current search. I don't remember if there was a reason why it has been done this way. Apparently, the unit test used that method to clear the search, but if we apply that change to master only, we should be safe.
Works for me. Old and new tests pass.