inspector: Remove the GtkAtSpiContext use

There is generic API to access the D-Bus object path of the
accessibility context object.

gtk/a11y/gtkatspicontext.c

@@ -1394,6 +1394,14 @@ gtk_at_spi_context_unrealize (GtkATContext *context)
   g_clear_object (&self->root);
 }
 
+static const char *
+gtk_at_spi_context_get_dbus_object_path (GtkATContext *context)
+{
+  GtkAtSpiContext *self = GTK_AT_SPI_CONTEXT (context);
+
+  return self->context_path;
+}
+
 static void
 gtk_at_spi_context_class_init (GtkAtSpiContextClass *klass)
 {
@@ -1409,6 +1417,7 @@ gtk_at_spi_context_class_init (GtkAtSpiContextClass *klass)
   context_class->platform_change = gtk_at_spi_context_platform_change;
   context_class->bounds_change = gtk_at_spi_context_bounds_change;
   context_class->child_change = gtk_at_spi_context_child_change;
+  context_class->get_dbus_object_path = gtk_at_spi_context_get_dbus_object_path;
 }
 
 static void

gtk/gtkatcontext.c

@@ -1152,3 +1152,37 @@ gtk_at_context_child_changed (GtkATContext             *self,
 
   GTK_AT_CONTEXT_GET_CLASS (self)->child_change (self, change, child);
 }
+
+/**
+ * gtk_at_context_get_dbus_object_path:
+ * @self: an accessibility context
+ *
+ * Returns the D-Bus object path of the accessibility context.
+ *
+ * If the accessibility context uses a D-Bus transport, the return value is
+ * the path at which you will be able to find the object.
+ *
+ * This function returns `NULL` if the accessibility context is unrealized,
+ * or it does not use D-Bus, or if the accessibility support has been
+ * disabled.
+ *
+ * Returns: (nullable) (transfer none): the D-Bus object path of the
+ *   accessibility context
+ *
+ * Since: 4.10
+ */
+const char *
+gtk_at_context_get_dbus_object_path (GtkATContext *self)
+{
+  g_return_val_if_fail (GTK_IS_AT_CONTEXT (self), NULL);
+
+  if (!self->realized)
+    return FALSE;
+
+  GtkATContextClass *klass = GTK_AT_CONTEXT_GET_CLASS (self);
+
+  if (klass->get_dbus_object_path != NULL)
+    return klass->get_dbus_object_path (self);
+  else
+    return NULL;
+}

gtk/gtkatcontext.h

@@ -45,4 +45,7 @@ GtkATContext *          gtk_at_context_create                   (GtkAccessibleRo
                                                                  GtkAccessible     *accessible,
                                                                  GdkDisplay        *display);
 
+GDK_AVAILABLE_IN_4_10
+const char *            gtk_at_context_get_dbus_object_path     (GtkATContext      *self);
+
 G_END_DECLS

gtk/gtkatcontextprivate.h

@@ -124,6 +124,8 @@ struct _GtkATContextClass
 
   void (* realize)       (GtkATContext *self);
   void (* unrealize)     (GtkATContext *self);
+
+  const char * (* get_dbus_object_path) (GtkATContext *self);
 };
 
 GtkATContext *          gtk_at_context_clone                    (GtkATContext          *self,

gtk/inspector/a11y.c

@@ -34,9 +34,6 @@
 #include "gtknoselection.h"
 #include "gtkfilterlistmodel.h"
 #include "gtkboolfilter.h"
-#ifdef G_OS_UNIX
-#include "a11y/gtkatspicontextprivate.h"
-#endif
 
 typedef enum {
   STATE,
@@ -233,17 +230,19 @@ update_path (GtkInspectorA11y *sl)
   const char *path = "—";
 #ifdef G_OS_UNIX
   GtkATContext *context;
+  const char *context_path;
 
   context = gtk_accessible_get_at_context (GTK_ACCESSIBLE (sl->object));
-  if (GTK_IS_AT_SPI_CONTEXT (context))
+  context_path = gtk_at_context_get_dbus_object_path (context);
+  if (context_path == NULL)
     {
-      if (gtk_at_context_is_realized (context))
-        path = gtk_at_spi_context_get_context_path (GTK_AT_SPI_CONTEXT (context));
-      else
+      if (!gtk_at_context_is_realized (context))
         path = "not realized";
+      else
+        path = "not available on accessibility bus";
     }
   else
-    path = "not on bus";
+    path = context_path;
 #endif
 
   gtk_label_set_label (GTK_LABEL (sl->path), path);