Overview of Changes in GTK+ 3.18.6
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* Bugs fixed:
 539944 Add GtkScaleButton API so struct fields can be marked as private
 732742 Infinite recursion on GdkDevice disposal
 735847 move animatable cursors' current frame info into GdkCursor
 746745 Window suddenly always on top
 747295 shared memory leak when creating/destroying widgets
 748904 wayland: map real modifiers to virtual modifiers
 757358 single touch devices are not detected as touch devices
 758025 cursor flickering
 758072 [Wayland] additional mouse buttons don't work
 758175 Fix character entity
 758327 gnome-disks segfault in gdkwayland get_popup_parent - dereference...
 758367 GTK+ 3 does not respect bold in org.gnome.desktop.interface font-name
 758407 Could not send the search request \ GDBus.Error:org.freedesktop...
 758483 GDK W32: Incorrectly uses SetWindowLong() to set/unset WS_EX_TOPMOST
 758484 GDK W32: Some calls to W32 routines are rather unclear
 758660 Copy and paste doesn't work in wayland session
 758661 every second right-click to window header is ignored (CSD-related?)
 758698 Bug backward search + case insensitive + preceding multi-byte character
 758790 A few stylistic icon-browser patches 

* Translation updates:
 Polish