Doing multiple searches and hiding the keyboard occasionally leaves results grayed-out

[kerrishotts]

Reported by @AdamDenoon

[kerrishotts]

For me, this seems to occur if I dismiss the keyboard without actually searching; the dark layer remains, and then tapping the search field creates it again (ad infinitum). Tapping the dark layer will only dismiss the last one, since that's all it keeps track of. Added code to detect when the search field stops editing (as opposed to only when it starts editing) to catch dismissals without searches.

Will be fixed next commit.