[gtk: 2/2] Merge branch 'fix-quadratic-add' into 'master'

[Timm Bäder <baedert src gnome org>]

commit 5535b26395bb824fa594f608d734266dc52a38ff
Merge: 4fb50c7408 d3e0a1f68c
Author: Timm Bäder <mail baedert org>
Date:   Fri Jun 5 02:57:38 2020 +0000

    Merge branch 'fix-quadratic-add' into 'master'
    
    Avoid quadratic slowdown in gtk_widget_add()
    
    See merge request GNOME/gtk!2027

 gtk/gtkwidget.c        | 47 ++++++++---------------------------------------
 gtk/gtkwidgetprivate.h |  1 -
 2 files changed, 8 insertions(+), 40 deletions(-)
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