fb0cf64536
We recently started to trim leading and trailing whitespace from the search string, and not to trigger a search when the resulting string was empty. However we still allow whitespace to trigger type-ahead-find, so that the key focus is moved briefly to the search entry and back to the stage, resulting in a disruptive flickering of the entry. Fix this by excluding whitespace from triggering type-ahead-find. https://bugzilla.gnome.org/show_bug.cgi?id=694475