[gtk] search entry: Fix property notification

[Matthias Clasen <matthiasc src gnome org>]

commit a1cc809c6098a4526f8f9197beff39ede3d1e940
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Mar 16 20:57:50 2019 -0400

    search entry: Fix property notification
    
    Both placeholder-text and activates-default were not
    up to our usual standards for property notification,
    and the tests complained.

 gtk/gtksearchentry.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtksearchentry.c b/gtk/gtksearchentry.c
index fd6dfed05f..45ace300e7 100644
--- a/gtk/gtksearchentry.c
+++ b/gtk/gtksearchentry.c
@@ -172,7 +172,11 @@ gtk_search_entry_set_property (GObject      *object,
       break;
 
     case PROP_ACTIVATES_DEFAULT:
-      gtk_text_set_activates_default (GTK_TEXT (priv->entry), g_value_get_boolean (value));
+      if (gtk_text_get_activates_default (GTK_TEXT (priv->entry)) != g_value_get_boolean (value))
+        {
+          gtk_text_set_activates_default (GTK_TEXT (priv->entry), g_value_get_boolean (value));
+          g_object_notify_by_pspec (object, pspec);
+        }
       break;
 
     default:
@@ -294,7 +298,7 @@ gtk_search_entry_class_init (GtkSearchEntryClass *klass)
                            P_("Placeholder text"),
                            P_("Show text in the entry when it’s empty and unfocused"),
                            NULL,
-                           GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
+                           GTK_PARAM_READWRITE);
 
   props[PROP_ACTIVATES_DEFAULT] =
       g_param_spec_boolean ("activates-default",