[gedit] (5 commits) ...spell-plugin: check that the buffer is still the same

[Sébastien Wilmet <swilmet src gnome org>]

Summary of changes:

  c179eea... spell-plugin: remove unused #define (*)
  2ffdd61... spell-plugin: don't use gedit_automatic_spell_checker_get_f (*)
  63fef71... auto-spell: remove gedit_automatic_spell_checker_get_from_b (*)
  d8b0128... spell-plugin: detach the view from the auto-spell (*)
  f90c810... spell-plugin: check that the buffer is still the same (*)

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