I searched for a certain binary collection. It resulted properly as the only row in the list of headers. I successfully dowloaded it all. I pressed the trash can on the top right of the header part of the window whose pop-up text says delete selected. I deleted the search string expecting to see all the other headers that did not match the search re-appear. But everything is gone. SImilarly if I choose to filter files only or texts only I'd expect only the visible headers to disappear, but the whole lot is gone when I hit the X to cancel the filter