An update for the gtk+ 3.14 branch just landed upstream. The changes involve:
* Bugs fixed:
 693738 gtk print dialog shows "Getting printer information failed"...
 738083 GtkMenuButton is not disabled even if corresponding GAction is
 745957 GTK+/Quartz >= 3.14.8: Symbol not found: _gtk_drag_cancel (...
 750011 Adwaita : missing background for menu
 750605 icontheme: don't modify symbolic SVG dimensions when recoloring
 750690 Recent Chooser Widget doesn't expand
 750870 gtk3 does apparently ignore replayed events?
 750994 X11: First mouse wheel event ignored after right click or Alt+Tab...
 751050 Moving the mouse while a stepper is activated causes the scrollba...
 751227 file picker list box height stretches to match extra widgets area...
 751443 resource_path value cleared in gtk_image_set_from_resource
 751739 Deadlock in X11 when setting XSetErrorHandler while another threa...
 751752 Memleak when both opening shm and opening file in tmp fail

* Translation updates:
 Icelandic
 Occitan

It would be useful to release a maintenance update for this for 13.2.