Merge branch 'wip/carlosg/controllers-backport' into 'gtk-3-24'

Wip/carlosg/controllers backport

See merge request GNOME/gtk!246

po/POTFILES.in

@@ -142,6 +142,9 @@ gtk/gtkentry.c
 gtk/gtkentrycompletion.c
 gtk/gtkeventbox.c
 gtk/gtkeventcontroller.c
+gtk/gtkeventcontrollerkey.c
+gtk/gtkeventcontrollermotion.c
+gtk/gtkeventcontrollerscroll.c
 gtk/gtkexpander.c
 gtk/gtkfilechooserbutton.c
 gtk/gtkfilechooser.c
@@ -170,6 +173,7 @@ gtk/gtkgesturemultipress.c
 gtk/gtkgesturepan.c
 gtk/gtkgesturerotate.c
 gtk/gtkgesturesingle.c
+gtk/gtkgesturestylus.c
 gtk/gtkgestureswipe.c
 gtk/gtkgesturezoom.c
 gtk/gtkglarea.c