[gtk+] (14 commits) Non-fast-forward update to branch wip/baedert/progressbar

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/progressbar' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  5fc9f45... box: Remove fill child property
  6dada02... actionbar: Add explicit center widget
  3e86a6b... container: Remove include_internals parameter from forall
  8d59611... box: Remove center child
  5a9b60a... testsuite: Add widget ordering test case
  fe38593... box: Compute clips directly
  171ee0f... container: Use gtk_container_forall less
  a8a1725... grid: Compute clip directly
  79da682... widget: Fix set_parent/unparent docs to not mention GtkCont
  fc817f2... gtkwidget: Queue a resize on the parent when unparenting
  52cc6a2... listbox: Compute clips directly
  9aa7b50... frame: Compute clip directly
  242f0ca... frameclock: add _gdk_frame_clock_set_paint_callback
  d4a2172... label: Don't use gtk_widget_set_simple_clip

Commits added to the branch:

  88cbd79... box: Remove fill child property
  2a4d1f6... actionbar: Add explicit center widget
  6cde473... container: Remove include_internals parameter from forall
  c005696... box: Remove center child
  98b3c56... testsuite: Add widget ordering test case
  18672fd... box: Compute clips directly
  5e602e4... container: Use gtk_container_forall less
  3fe03d8... grid: Compute clip directly
  cf51e2c... widget: Fix set_parent/unparent docs to not mention GtkCont
  df14af4... gtkwidget: Queue a resize on the parent when unparenting
  5a034f3... listbox: Compute clips directly
  02ff0ab... frame: Compute clip directly
  9467139... frameclock: add _gdk_frame_clock_set_paint_callback
  c0febea... label: Don't use gtk_widget_set_simple_clip