[gtk] (17 commits) ...Merge branch 'matthiasc/for-master' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  07a3fb8... textlayout: Remove some unnecessary code (*)
  67ee6b2... textlayout: Don't call render_para too much (*)
  214e2d1... textbtree: Avoid malloc in one place (*)
  a936144... textbtree: Speed up _gtk_text_line_char_index (*)
  d731ce4... textbtree: Don't opencode realloc (*)
  0334d00... textbtree: Speed up _gtk_text_btree_find_line_top (*)
  58e44e2... textbtree: Inline node data handling (*)
  5b8bf04... texttag: Just use qsort (*)
  b0df891... textlayout: Only get selection color once (*)
  d719a3d... textbtree: Return tags in a GPtrArray (*)
  5b0ea70... textattributes: Small docs fix (*)
  2af99bd... textlayout: Create the cursor snapshot on demand (*)
  b32cd5d... textlayout: Introduce some locals (*)
  6cf7125... textlayout: Avoid allocations for line iteration (*)
  2e18f1b... textlayout: Remove an unused function (*)
  a1ece16... ngl: Fix an oversight (*)
  0ca5731... Merge branch 'matthiasc/for-master' into 'master'

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