Key focus shifts to directory menu
When the search entry is selected and up arrow is pressed, focus switches to the search directory dropdown. Down arrow does not switch focus back, but changes the dropdown option, trapping the focus in that dropdown.
Since up arrow also shifts focus from the first search result to the search entry, holding the up arrow a moment too long in the search results often ends up changing focus to the search entry, changing focus to the directory dropdown, and then changing the selected directory all before the user notices.
Suggestion: Don't allow up arrow to switch focus between the search entry and directory dropdown (unless there is a way to make down arrow return to search entry without changing the dropdown value).