[pango] (21 commits) ...Merge branch 'wip/baedert/for-master2' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  b0c9b98... layout: Ignore setting the width if it won't have any effec (*)
  993ac0a... pangocairo-context: Don't invalidate if font options are eq (*)
  03774a4... layout: Try to avoid some work when creating iters (*)
  99431a5... Allocate internal PangoAttrListIterators on the stack (*)
  62fd1b5... layotu: Avoid invalidating when setting attrs from NULL to  (*)
  25049ad... layout: Add missing (nullable) annotation (*)
  c802c85... Allocate internal PangoAttrLists on the stack (*)
  0efa313... layout: Avoid getting the text length if we know it already (*)
  a79e38a... attributes: Add _pango_attr_list_has_attributes (*)
  cc5b6c7... break_attrs: Bail out if we have no ALLOW_BREAKS attributes (*)
  1724822... break: Make a local const (*)
  4289a20... break: Only call break_attrs if we really have attributes (*)
  fd7e209... glyph-item: Allocate attr iterator on the stack (*)
  4d658d4... testattributes: Properly free GString (*)
  c1943bd... pango-layout: Try to avoid allocating a new PangoAttrList (*)
  9b7b67f... layout: Unconditionally unref attr lists (*)
  ea6248f... layout: Treat empty attr lists like NULL ones (*)
  cc3d06b... testattributes: Test iter on empty attr list (*)
  f512663... test-common: Ignore null attr lists (*)
  4d8e714... tests: Update expected output (*)
  8175bfe... Merge branch 'wip/baedert/for-master2' into 'master'

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