[glib: 4/4] Merge branch 'gtree-add-iterators' into 'master'

[Philip Withnall <pwithnall src gnome org>]

commit 7bfd6278b92b8ad8c57fe288e1d7d7075b4dcf1f
Merge: 1538a89b1 6569529e1
Author: Philip Withnall <philip tecnocode co uk>
Date:   Tue Oct 6 13:43:18 2020 +0000

    Merge branch 'gtree-add-iterators' into 'master'
    
    GTree: add an ability to iterate over a tree and a node-based API
    
    See merge request GNOME/glib!1509

 docs/reference/glib/glib-sections.txt |  15 ++
 glib/gtree.c                          | 475 ++++++++++++++++++++++++++++++----
 glib/gtree.h                          |  71 +++++
 tests/testglib.c                      | 187 ++++++++++++-
 4 files changed, 691 insertions(+), 57 deletions(-)
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