[gtk/matthiasc/atspi-child] a11y: Skip non-presented children when required

[Matthias Clasen <matthiasc src gnome org>]

commit 46e754a17d267476daca4ea8fe879060c71a7f54
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 24 11:22:09 2020 -0400

    a11y: Skip non-presented children when required
    
    Whenever we determine the index of a child, we need
    to skip its non-presented siblings.

 gtk/a11y/gtkatspicontext.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/a11y/gtkatspicontext.c b/gtk/a11y/gtkatspicontext.c
index 18a1d7ff9c..2e838b1ef6 100644
--- a/gtk/a11y/gtkatspicontext.c
+++ b/gtk/a11y/gtkatspicontext.c
@@ -1168,6 +1168,9 @@ gtk_at_spi_context_child_change (GtkATContext             *ctx,
            iter != NULL;
            iter = gtk_widget_get_next_sibling (iter))
         {
+          if (!gtk_accessible_should_present (GTK_ACCESSIBLE (iter)))
+            continue;
+
           if (iter == child_widget)
             break;