[gtk/a11y/atspi: 1/3] atspi: Set placeholder-text attribute

[Matthias Clasen <matthiasc src gnome org>]

commit 81440675af64f0b18d13085af2759bcca97cdc92
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Oct 12 23:20:58 2020 -0400

    atspi: Set placeholder-text attribute
    
    This is how GTK3 passes placeholder-text to orca,
    and it works - orca reads it.

 gtk/a11y/gtkatspicontext.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/gtk/a11y/gtkatspicontext.c b/gtk/a11y/gtkatspicontext.c
index a8d3f16563..92562e4a04 100644
--- a/gtk/a11y/gtkatspicontext.c
+++ b/gtk/a11y/gtkatspicontext.c
@@ -401,6 +401,17 @@ handle_accessible_method (GDBusConnection       *connection,
 
       g_variant_builder_open (&builder, G_VARIANT_TYPE ("a{ss}"));
       g_variant_builder_add (&builder, "{ss}", "toolkit", "GTK");
+
+      if (gtk_at_context_has_accessible_property (GTK_AT_CONTEXT (self), 
GTK_ACCESSIBLE_PROPERTY_PLACEHOLDER))
+        {
+          GtkAccessibleValue *value;
+
+          value = gtk_at_context_get_accessible_property (GTK_AT_CONTEXT (self), 
GTK_ACCESSIBLE_PROPERTY_PLACEHOLDER);
+
+          g_variant_builder_add (&builder, "{ss}",
+                                 "placeholder-text", gtk_string_accessible_value_get (value));
+        }
+
       g_variant_builder_close (&builder);
 
       g_dbus_method_invocation_return_value (invocation, g_variant_builder_end (&builder));