main: Fix grammar mistake in comment
main: Don't hide the custom-title in search mode

If we don't have a search title to set just yet. We'll use that
to show the depressed source buttons instead.

https://bugzilla.gnome.org/show_bug.cgi?id=723823
main: Make view switcher remain visible when search is on

https://bugzilla.gnome.org/show_bug.cgi?id=723823