[gtk/wip/otte/for-main: 1/2] widget: Don't queue an allocate on a nonexisting parent

[Benjamin Otte <otte src gnome org>]

commit 7149bfd100c97e5cf91586cff9915695bf2f1028
Author: Benjamin Otte <otte redhat com>
Date:   Sun Dec 26 22:17:54 2021 +0100

    widget: Don't queue an allocate on a nonexisting parent
    
    No test, no idea how to trigger this reliably.

 gtk/gtkwidget.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 092f763bdc..afe7e9224e 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -4971,7 +4971,8 @@ gtk_widget_real_css_changed (GtkWidget         *widget,
             {
               gtk_widget_queue_resize (widget);
             }
-          else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TRANSFORM))
+          else if (gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_TRANSFORM) &&
+                   priv->parent)
             {
               gtk_widget_queue_allocate (priv->parent);
             }