[nautilus] (15 commits) ...toolbar: Stop using ::populate-popup

[António Fernandes <antoniof src gnome org>]

Summary of changes:

  996ca51... general: Stop using GtkWindow API which is gone in GTK4 (*)
  d625b9b... window: Drop GdkScreen parameter from ::new() (*)
  0d25623... application: Stop using GdkScreen for style providers (*)
  363f3ed... program-choosing: Replace GdkScreen with GdkDisplay (*)
  225f1df... general: Stop using GtkButton:relief and GtkScrolledWindow: (*)
  c77ac30... floating-bar: Stop overriding widget measurement vfunc (*)
  21a7835... pathbar: Stop overriding GtkWidget.style_updated() and .scr (*)
  a7ddc6f... general: Stop using GdkCursorType (*)
  be23d8a... general: Prepare for non-GtkBin scrolled window (*)
  9e15ee2... window-slot: Drop non-window usage of gtk_widget_destroy() (*)
  e004836... files-view: Stop using gtk_widget_get_action_group() (*)
  212f7ef... window: Simplify save_geometry() (*)
  8a7f041... view-icon-controller: Stop using gtk_container_get_focus_ch (*)
  447ebe7... toolbar: Stop using GtkToggleButton method on GtkMenuButton (*)
  d1109fb... toolbar: Stop using ::populate-popup (*)

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