libgtk3-nocsd0 - 3-1+b1 main

libgtk3-nocsd is a small LD_PRELOADable library used to disable the
client side decorations (CSD) of Gtk+ 3.
.
Since Gtk+ 3.10, its developers added a so-called header bar or custom
title bar. With this and the client-side decoration, the original
title bar and window border provided by the window manager are
disabled by Gtk+. This makes all Gtk+ 3 programs look like alike, but
have different handling from other windows on non-GNOME desktops. Even
worse, this may break some window manager or compositors.
.
Unfortunately, there is no reliable way of turning off CSDs in Gtk+
directly. This library makes this possible.