[gtk/ebassi/for-master: 8/9] a11y: Skip atspi.Cache signals for hidden elements

[Emmanuele Bassi <ebassi src gnome org>]

commit 38cb9c0a0bee23222e12142a2f8cafd425b706b7
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Nov 19 14:46:01 2020 +0000

    a11y: Skip atspi.Cache signals for hidden elements
    
    If the accessible object is hidden, we can skip the emission of the
    AddAccessible and RemoveAccessible signals on the cache, as those
    objects won't be visible in the accessibility tree.

 gtk/a11y/gtkatspicache.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
---
diff --git a/gtk/a11y/gtkatspicache.c b/gtk/a11y/gtkatspicache.c
index 81bfd030f2..10736341e5 100644
--- a/gtk/a11y/gtkatspicache.c
+++ b/gtk/a11y/gtkatspicache.c
@@ -176,6 +176,18 @@ static void
 emit_add_accessible (GtkAtSpiCache   *self,
                      GtkAtSpiContext *context)
 {
+  GtkATContext *at_context = GTK_AT_CONTEXT (context);
+
+  /* If the context is hidden, we don't need to update the cache */
+  if (gtk_at_context_has_accessible_state (at_context, GTK_ACCESSIBLE_STATE_HIDDEN))
+    {
+      GtkAccessibleValue *is_hidden =
+        gtk_at_context_get_accessible_state (at_context, GTK_ACCESSIBLE_STATE_HIDDEN);
+
+      if (gtk_boolean_accessible_value_get (is_hidden))
+        return;
+    }
+
   GVariantBuilder builder = G_VARIANT_BUILDER_INIT (G_VARIANT_TYPE ("(" ITEM_SIGNATURE ")"));
 
   collect_object (self, &builder, context);
@@ -194,6 +206,18 @@ static void
 emit_remove_accessible (GtkAtSpiCache   *self,
                         GtkAtSpiContext *context)
 {
+  GtkATContext *at_context = GTK_AT_CONTEXT (context);
+
+  /* If the context is hidden, we don't need to update the cache */
+  if (gtk_at_context_has_accessible_state (at_context, GTK_ACCESSIBLE_STATE_HIDDEN))
+    {
+      GtkAccessibleValue *is_hidden =
+        gtk_at_context_get_accessible_state (at_context, GTK_ACCESSIBLE_STATE_HIDDEN);
+
+      if (gtk_boolean_accessible_value_get (is_hidden))
+        return;
+    }
+
   GVariant *ref = gtk_at_spi_context_to_ref (context);
 
   g_dbus_connection_emit_signal (self->connection,