The last round of filechooser redesign work had left
search somewhat dysfunctional. This commit fixes things
up enough that search is once again a working feature
of the file chooser.
Most of the core GNOME applications (eg., gnome-control-center,
gnome-documents, and nautilus) start searching as soon as the text
changes, and don't wait for the user to hit ENTER. It would be nice to
follow the same pattern.
https://bugzilla.gnome.org/show_bug.cgi?id=739977
This subdirectory gets in the way when integrating the inspector
build more fully with GTK+, and does not really add anything.
Just move everything one level up.
