Make search window the parent for popups when it is open
Make search window the parent for popups when it is open

In Gnome 3, the popup windows appear as drop-downs from their parent
window's title bar.  Thus, when the search window produced a popup, the
popup was connected to the base window, not the search window, which
made it easy to miss.  This fixes that in a quick-and-dirty manner.

closes #376

bobi32/gummi,bobi32/gummi,mlda065/gummi,mlda065/gummi,turbopobre/gummi,mlda065/gummi,alexandervdm/gummi,turbopobre/gummi,alexandervdm/gummi,mlda065/gummi,turbopobre/gummi,alexandervdm/gummi,turbopobre/gummi,bobi32/gummi,bobi32/gummi