[gtk+/scrollable] (20 commits) ...Reenabled treeview-scrolling test with fix to the test to call the new scrolling api.

[Tristan Van Berkom <tvb src gnome org>]

Summary of changes:

  ba32934... Add gtk_combo_box_{get,set}_popup_fixed_width to gtk.symbol (*)
  f891c58... Don't use old GtkComboBoxEntry in gail (*)
  6db62c6... Use new GtkComboBoxEntry in all tests (*)
  8d456e3... Updated Spanish translation (*)
  b613cc6... Don't add a second cell renderer (*)
  8cca398... Gdk X11: Add setter for startup notify ID (*)
  d34b9ed... introspection: Filter out all headers ending in "private" (*)
  206b41c... widget: Remove special case in gtk_widget_queue_draw_area() (*)
  e0d7da3... x11: Set GDK_PIXBUF_ENABLE_BACKEND before including files (*)
  6e90804... notebook: Hi, I can't get my function prototypes right (*)
  3a55137... selection: Hi, I can't get my code right (*)
  3b8a264... print: Make things compile again (*)
  9e31ef6... cups: Add hack to work around gcc warning (*)
  ff142ac... gtk: Add gtk_widget_queue_draw_region() (*)
  ab5fb5d... GtkApplication rewrite (*)
  bf4ee1b... configure.ac: Update Glib required version to 2.27.1 (*)
  04900c8... docs: Update templates (*)
  781c07e... Merge branch 'master' into scrollable
  75b6524... Added missing gtk/gtkscrollable.h to gtk/gtk.h
  90ec7de... Reenabled treeview-scrolling test with fix to the test to c

(*) This commit already existed in another branch; no separate mail sent