[gtk: 7/7] Merge branch 'async-highlight' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 619140465653980d7aaabde83814595b4136bebe
Merge: 0228c89011 bcc5e475fc
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 13 21:15:09 2020 +0000

    Merge branch 'async-highlight' into 'master'
    
    gtk-demo: Async highlight
    
    See merge request GNOME/gtk!2435

 demos/gtk-demo/fontify.c   | 458 +++++++++++++++++++++++++++++++++++++++++++++
 demos/gtk-demo/fontify.h   |   6 +
 demos/gtk-demo/main.c      | 136 +-------------
 demos/gtk-demo/meson.build |   1 +
 gtk/gtktextbuffer.c        | 116 +++++-------
 5 files changed, 515 insertions(+), 202 deletions(-)
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