Log Message:
Update gtk3 to 3.16.6

Overview of changes in GTK+ 3.16.4
==================================

* Bug fixes:
 693738 gtk print dialog shows "Getting printer information failed" for...
 719683 Escaping issue "Failed to set text from markup due to error par...
 745957 GTK+/Quartz >= 3.14.8: Symbol not found: _gtk_drag_cancel (MyPa...
 749451 Windows have no border
 749593 Miscellaneous test fixes
 749893 Crash when trying to drag a tab from a populated GtkNotebook in...
 750058 bad options for the keybindings in css instructions generate a ...
 750384 GtkDialog can not be moved when gtk_dialog_run from GtkListBox ...
 750477 GtkFileChooserButton's label isn't xalign=0'ed
 750505 Main grid overlaps GtkPopover

* Translation updates:
 Czech
 Occitan
 Polish
 Slovenian

Overview of changes in GTK+ 3.16.5
==================================

* Bug fixes:
 750489 gtk settings c910 warning unexpected annotation element type command
 750605 icontheme: don't modify symbolic SVG dimensions when recoloring
 750690 Recent Chooser Widget doesn't expand
 750718 Improve documentation for deprecated properties
 750870 gtk3 does apparently ignore replayed events?
 750888 Fix return value error in _gtk_text_handle_set_direction
 750994 X11: First mouse wheel event ignored after right click or Alt+Tab...
 751018 Widget: GtkMenuButton+GtkPopover gtk_toggle_button_set_active() n...
 751050 Moving the mouse while a stepper is activated causes the scrollba...
 751082 GtkTreeView draw performance is bad when contents are not larger ...
 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
 751754 GtkSwitch: calling gtk_switch_set_active in the handler for notif...
        Fix ridge/groove border rendering
        GtkListBoxRow: propagate in the draw vfunc

* Translation updates:
 German

Overview of changes in GTK+ 3.16.6
==================================

* OS X: Partial aspect ratio support

* Revert a problematic change to scroll event handling

* Bug fixes:
 741800 GTK3 apps have huge rendering pauses/hangs over SSH connection
 751401 crash on DnD
 751625 build error with pure wayland
 752016 testgmenu: use the menu binding code
 752093 Improvement to GtkImageMenuItem long description and code snippet
 752520 Crash getting a NULL visual in glx_pixmap_get

* Translation updates:
 Czech
 Hungarian
 Lithuanian
 Polish
 Slovenian