Removing overlay scrollbars. export GTK_OVERLAY_SCROLLING=0 fails

[John Coppens <john jcoppens com>]

Several programs (such as Geeqie) have the overlay scrollbars enabled,
but this causes serious problem when selecting images from the list.
The last item of the list is nearly invisible - only 1 pixels shows
above the scrollbar, making it difficult to hit with the cursor. Even
more so because there is no visual feedback.

export GTK_OVERLAY_SCROLLING=0  actually works, but now the labels in
the directory treeview are invisible (i.e., the small triangle to 
fold/unfold directories are present and work, but the text to the right 
is missing. How is this related to the scrollbars?

I have GTK 3.16.3 installed.

John