[gtk/wip/baedert/for-master: 155/155] inspector: Add a type check

[Timm Bäder <baedert src gnome org>]

commit 9ac34f236c4f355d23d24c177d1594256e851d20
Author: Timm Bäder <mail baedert org>
Date:   Sat Aug 1 07:58:36 2020 +0200

    inspector: Add a type check
    
    We only connect to this signal if sl->obejct is a GtkAccessible, so only
    disconnect from it on the same condition.
    
    Fixes 2980

 gtk/inspector/a11y.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/inspector/a11y.c b/gtk/inspector/a11y.c
index 8207c47d52..45d6a9f561 100644
--- a/gtk/inspector/a11y.c
+++ b/gtk/inspector/a11y.c
@@ -390,7 +390,8 @@ gtk_inspector_a11y_set_object (GtkInspectorA11y *sl,
   GtkWidget *stack;
   GtkStackPage *page;
   GtkATContext *context;
-  if (sl->object)
+
+  if (sl->object && GTK_IS_ACCESSIBLE (sl->object))
     {
       context = gtk_accessible_get_at_context (GTK_ACCESSIBLE (sl->object));
       g_signal_handlers_disconnect_by_func (context, refresh_all, sl);