[gtk] editable: Fix a thinko

[Matthias Clasen <matthiasc src gnome org>]

commit 26f99bf20c92b3689fa6235f2aea6f57871fa525
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 17 18:44:36 2019 -0400

    editable: Fix a thinko
    
    When dealing with subclasses of GtkEntry, we were not
    getting the property offset that is stored on the GtkEntry
    type.
    
    This was showing up as criticals when trying to set
    ::width-chars on a GtkFileChooserEntry.

 gtk/gtkeditable.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkeditable.c b/gtk/gtkeditable.c
index f710d51cc0..9569c4bc20 100644
--- a/gtk/gtkeditable.c
+++ b/gtk/gtkeditable.c
@@ -935,7 +935,10 @@ gtk_editable_delegate_set_property (GObject      *object,
   GType type = G_TYPE_FROM_INSTANCE (object);
   guint first_prop;
 
-  first_prop = GPOINTER_TO_UINT (g_type_get_qdata (type, quark_editable_data));
+  do {
+    first_prop = GPOINTER_TO_UINT (g_type_get_qdata (type, quark_editable_data));
+    type = g_type_parent (type);
+  } while (first_prop == 0 && type != 0);
 
   if (prop_id < first_prop)
     return FALSE;
@@ -994,7 +997,10 @@ gtk_editable_delegate_get_property (GObject    *object,
   GType type = G_TYPE_FROM_INSTANCE (object);
   guint first_prop;
 
-  first_prop = GPOINTER_TO_UINT (g_type_get_qdata (type, quark_editable_data));
+  do {
+    first_prop = GPOINTER_TO_UINT (g_type_get_qdata (type, quark_editable_data));
+    type = g_type_parent (type);
+  } while (first_prop == 0 && type != 0);
 
   if (prop_id < first_prop)
     return FALSE;