[gtk] (53 commits) ...Merge branch 'bin-removal' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  7f97547... frame: Add a child property (*)
  1706b80... Use gtk_frame_set_child throughout (*)
  25826ea... frame: Derive from GtkWidget (*)
  e137152... aspectframe: Add a child property (*)
  1f63896... Use gtk_aspect_frame_set_child throughout (*)
  5b06b08... aspectframe: Derive from GtkWidget (*)
  4a133b4... fishbow: fixup premature popover (*)
  71433d0... aspect frame use fixup (*)
  937c94b... viewport: Add a child property (*)
  e9ddf0f... Use gtk_viewport_set_child throughout (*)
  e098ffb... viewport: Derive from GtkWidget (*)
  ee284a5... popover: Add a child property (*)
  8e26105... Use gtk_popover_set_child throughout (*)
  ee1f8d8... popover: Derive from GtkWidget (*)
  54b6133... scrolledwindow: Add a child property (*)
  67759d4... Use gtk_scrolled_window_set_child throughout (*)
  9d7b77f... scrolledwindow: Derive from GtkWidget (*)
  04e4a02... button: Add a child property (*)
  af6e0ee... Use gtk_button_set_child throughout (*)
  183431c... checkbutton: Modernize (*)
  07441ad... css tests: Update expected results (*)
  97d0e8c... css testsuite: Remove an obsolete test (*)
  4aa5fba... button: Derive from GtkWidget (*)
  b9b1bf8... window: Add a child property (*)
  f59f355... Use gtk_window_set_child throughout (*)
  9a65ed9... window: Derive from GtkWidget (*)
  686be57... revealer: Add a child property (*)
  649ae63... Use gtk_revealer_set_child throughout (*)
  41322e2... revealer: Derive from GtkWidget (*)
  b8d1a9e... flowboxchild: Derive from GtkWidget (*)
  12ecbd1... listboxrow: Derive from GtkWidget (*)
  e2abe6d... searchbar: Add a child property (*)
  99ef14b... Use gtk_search_bar_set_child throughout (*)
  3a9883b... searchbar: Derive from GtkWidget (*)
  53f9737... overlay: Add a child property (*)
  77af8e3... Use gtk_overlay_set_child throughout (*)
  edd5d36... overlay: Derive from GtkWidget (*)
  b96d7b6... Add gtk_overlay_remove_overlay (*)
  e2781af... testgtk: Fix g_object_new use (*)
  44f9a51... testkineticscrolling: Make this work again (*)
  5d26af0... combobox: Add a child property (*)
  ec394e8... Use gtk_combo_box_set_child throughout (*)
  aae25c4... combobox: Derive from GtkWidget (*)
  0ec5a3f... tooltipwindow: Derive from GtkWidget (*)
  dec5707... builder-tool: Convert former bin children (*)
  d8e4738... Add a test for bin child conversion (*)
  fa848e9... gtk-demo: Port blur demo from GtkBin (*)
  8d0773f... inspector: Derive recorder from GtkWidget (*)
  cac514f... testtooltips: Derive demo from GtkWidget (*)
  3c165b3... Drop GtkBin (*)
  17c2151... testsuite: Update a testcase (*)
  4735d38... docs: Fixup for an uninitialized variable (*)
  b74a3de... Merge branch 'bin-removal' into 'master'

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