atspi: Be more careful

We have non-widget accessibles now, so guard against
change notification being emitted on them.

diff --git a/gtk/a11y/gtkatspicontext.c b/gtk/a11y/gtkatspicontext.c
index 53b39c474323b3b3e0936ae85190355ce9db44c3..12775e94cd085eaaede5754d1fab4f82a6f2b9e0 100644 (file)
--- 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;