Bug#803423: #803423 libqt5gui5: Ugly GUI (no icons) / Weird interpretation of XDG_CURRENT_DESKTOP and GNOME_DESKTOP_SESSION_ID

[Vladimir K]

I'm experiencing this issue too.
My session is plain openbox with some environment tweaks: 

export XDG_CURRENT_DESKTOP=OPENBOX
export GTK2_RC_FILES="$XDG_CONFIG_HOME/gtkrc-2.0:/etc/gtk-2.0/gtkrc"
export QT_STYLE_OVERRIDE=gtk

qt5 apps get theme successfully, but fail to get icons, all icons are missing.