[gtk] (4 commits) Non-fast-forward update to branch default-handling

[Matthias Clasen <matthiasc src gnome org>]

The branch 'default-handling' 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:

  9ef9098... widget: Remove special handling of has-focus
  ceffc58... Drop gtk_window_activate_focus
  c813c03... inspector: Stop showing default widget in misc

Commits added to the branch:

  9def217... window: Fix up the buildable implementation
  507f398... widget: Remove special handling of has-focus
  ea7d8be... Drop gtk_window_activate_focus
  b05ba12... inspector: Stop showing default widget in misc