hg: jdk/jdk13: 8225423: GTK L&F: JSplitPane: There is no divider shown

[prasanta.sadhukhan at oracle.com]

Changeset: 7b11ce080798
Author:    psadhukhan
Date:      2019-07-12 09:27 +0530
URL:       https://hg.openjdk.java.net/jdk/jdk13/rev/7b11ce080798

8225423: GTK L&F: JSplitPane: There is no divider shown
Reviewed-by: prr, serb

! src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c
! src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.h