[gtk: 2/2] Merge branch 'default-decoration-dialogs' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

commit 0e9085ac7efb9c1793fb30a5b071943932742d46
Merge: bb2e362533 66c8a996f9
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon May 13 02:39:37 2019 +0000

    Merge branch 'default-decoration-dialogs' into 'master'
    
    dialog: Use default decoration for non-custom headerbars
    
    See merge request GNOME/gtk!836

 gtk/gtkdialog.c           |  3 +++
 gtk/gtkheaderbar.c        | 31 +++++++++++++++++++++++++++++++
 gtk/gtkheaderbarprivate.h |  1 +
 gtk/ui/gtkdialog.ui       |  1 +
 4 files changed, 36 insertions(+)
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