[gtk: 3/3] Merge branch 'wip/chergert/undo-fixes' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit e41bf097d01011521f0235ab5f401f88fb188f39
Merge: 7a82e9f557 659393049e
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 24 12:36:30 2021 +0000

    Merge branch 'wip/chergert/undo-fixes' into 'master'
    
    texthistory: add barriers after final grouping
    
    Closes #4276
    
    See merge request GNOME/gtk!3989

 gtk/gtktexthistory.c        |  6 ++++++
 gtk/gtktextview.c           | 25 ++++++++++++++++++++-----
 testsuite/gtk/texthistory.c | 18 ++++++++++++++++++
 3 files changed, 44 insertions(+), 5 deletions(-)
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