[gtk+/native-layout] (34 commits) ...Merge branch 'master' into native-layout

[Tristan Van Berkom <tvb src gnome org>]

Summary of changes:

  ddc184e... gdk: Remove nonexistant symbols (*)
  159caba... Add gtk_license_get_type() to gtk.symbols (*)
  8b917ee... quartz: make it compile (*)
  cd00b0a... avoid redundant recursion for executing tests (*)
  e4a8337... Improve the looks of the license text in GtkAboutDialog (*)
  8313c7f... Updated Slovenian translation (*)
  0513476... Revert "Added UG translation" AGAIN (*)
  e6ed4da... GtkCalendar: move public members to private structure (*)
  1516c86... Use accessor funcions to access GtkCalendar (*)
  97fbf97... GtkTextTagTable: move public members to private structure (*)
  c989d30... API: Add gdk_window_create_similar_surface() (*)
  cc09ec0... gtk-demo: update drawingarea example (*)
  05e33f6... gtk_range_set_min_slider_size() should receive an gint, not (*)
  6334d13... Remove some leftovers of deprecated functionality (*)
  fc17055... gdk: Do final copy with OPERATOR_SOURCE in end_implicit_pai (*)
  ca7d3f9... gdk: When using OPERATOR_SOURCE, use clip + paint instead o (*)
  83c20d4... GtkToolbar: move public members to private structure (*)
  374d509... Use accessor functions to access GtkToolbar (*)
  0b29f4e... Remove window background getters again (*)
  dc7a8f9... tests: unbreak testwindows test (*)
  14cc894... quartz: gdk_window_get_frame_extents() needs to get effecti (*)
  c411df5... Updated Spanish translation (*)
  6a88255... Updated Spanish translation (*)
  a0a302f... Updated Spanish translation (*)
  7993ee6... Updated Galician translations (*)
  8805b58... textview: Fix rendering of embedded images (*)
  2944561... API: Add gdk_window_get_background_pattern() (*)
  434b3e1... gdk: Use gdk_window_get_background_pixmap() when setting up (*)
  e057cb8... Drop some unnecessary variables (*)
  0ea8572... Drop internal function from header (*)
  db3af40... NEWS for 2.90.6 (*)
  ce08b9b... Fix some documentation issues (*)
  6917d46... Remove a dangling reference (*)
  7285683... Merge branch 'master' into native-layout

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