[gtk/a11y/component: 178/183] atspi: Be more careful

[Matthias Clasen <matthiasc src gnome org>]

commit dfe00c4ac46c39b26077dfdec57356a985502f62
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 19 11:55:44 2020 -0400

    atspi: Be more careful
    
    We have non-widget accessibles now, so guard against
    change notification being emitted on them.

 gtk/a11y/gtkatspicontext.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/gtk/a11y/gtkatspicontext.c b/gtk/a11y/gtkatspicontext.c
index 53b39c4743..12775e94cd 100644
--- a/gtk/a11y/gtkatspicontext.c
+++ b/gtk/a11y/gtkatspicontext.c
@@ -787,9 +787,14 @@ gtk_at_spi_context_state_change (GtkATContext                *ctx,
                                  GtkAccessibleAttributeSet   *relations)
 {
   GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (ctx);
-  GtkWidget *widget = GTK_WIDGET (gtk_at_context_get_accessible (ctx));
+  GtkAccessible *accessible = gtk_at_context_get_accessible (ctx);
+  GtkWidget *widget;
   GtkAccessibleValue *value;
 
+  if (!GTK_IS_WIDGET (accessible))
+    return;
+
+  widget = GTK_WIDGET (accessible);
   if (!gtk_widget_get_realized (widget))
     return;