[gedit] (8 commits) ...print-preview: clarify preview_draw()

[Sébastien Wilmet <swilmet src gnome org>]

Summary of changes:

  de5bc34... print-preview: rename paper_w -> paper_width and paper_h -> (*)
  f585c21... print-preview: use better field types in GeditPrintPreview  (*)
  ed97b92... print-preview: don't use gtk_adjustment_value_changed() (de (*)
  b99138c... print-preview: clearer field names for the widgets (*)
  54a177e... print-preview: tile_w -> tile_width, tile_h -> tile_height (*)
  b31975d... print-preview: set has-tooltip in the .ui file (*)
  58d8b25... print-preview: various small code improvements (*)
  8109ab5... print-preview: clarify preview_draw() (*)

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