Hi, This is also backported into 3.14 branch upstream [1] and is included in 3.14.14 release. So, backporting to Jessie should be trivial I think.
Or even better: update GTK+3 in Jessie to the latest 3.14.x bugfix release. [1] https://git.gnome.org/browse/gtk+/commit/?h=gtk-3-14&id=d8e880f7f18ef3d2d6092bb57e37d91ce808fe82
