Created attachment 124358 [details] correct dialog with blue line and black font it is not possible to identify any more which tab is active in dialogs, making navigation quite confusing. see attached screenshot
Created attachment 124359 [details] libreoffice dialog missing any visual clue of active tab
I can’t reproduce this issue in Ubuntu 16.04 (using GTK+ 3.18): for me, the Adwaita theme correctly draws its blue underline below the active tab.
Interesting. I am on opensuse with Gtk 3.20
Same problem for me on Arch. Using adwaita theme on gnome 3.20.1 (gtk3 3.20.3-1).
NEW per comment 4.
Fixed this by https://cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-5-1&id=d80e87a91f25f78239d36ab4a4550173e8d6184b a few days ago