[gtk] (20 commits) ...Merge branch 'bilelmoussaoui/g-i' into 'main'

[Emmanuele Bassi <ebassi src gnome org>]

Summary of changes:

  a336fe2... gdk: add missing nullable annotations (*)
  9035719... gtk: add nullable annotation to gtk_css_section_get_file (*)
  ddb2e91... gtk: add nullable annotations for Scrollable getters (*)
  95169ad... gtk: add nullable annotations to PopoverMenuBar/PopoverMenu (*)
  e7fc8ad... gtk: fix PasswordEntry annotation (*)
  f846eec... gtk: mark gtk_no_selection_get_model nullable (*)
  985a39d... gtk: mark gtk_native_get_for_surface as nullable (*)
  b803bb5... gtk: mark MultiSelection::get_model as nullable (*)
  30d8c8e... gtk: mark buildable_get_id as nullable (*)
  dcbf3f8... gtk: mark gtk_lock_button_get_permission as nullable (*)
  d58b7fa... gtk: mark gtk_text_mark_get_buffer as nullable (*)
  77f7caf... gtk: mark gtk_glarea_get_context as nullable (*)
  0657044... gtk: mark gtk_icon_view_create_drag_icon as nullable (*)
  1d72024... gtk: mark MenuButton::get_label/get_icon_name as nullable (*)
  1e9bdb4... gtk: mark gtk_list_box_get_adjustment as nullable (*)
  d029b62... gtk: mark gtk_mount_operation_get_parent as nullable (*)
  38b8da0... gtk: mark gtk_flatten_list_model_get_model_for_item as null (*)
  afeb7f6... gtk: mark few GtkFileChooser functions as nullable - get_fi (*)
  9409b7e... gtk: mark few GtkPrinterSettings as nullable (*)
  5301367... Merge branch 'bilelmoussaoui/g-i' into 'main'

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