[gnome-builder] prefs: make custom prefs widget visible when added

[Sébastien Lafargue <slafargue src gnome org>]

commit b444e036ec3a9fe4519cc6cc645b7fb9f6623b8c
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Thu Feb 25 18:24:28 2016 +0100

    prefs: make custom prefs widget visible when added
    
    When using ide_preferences_perspective_add_custom
    to add a custom widget, it is set visible
    ( only it, not children )

 libide/preferences/ide-preferences-perspective.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libide/preferences/ide-preferences-perspective.c 
b/libide/preferences/ide-preferences-perspective.c
index 10a8d0e..e862e21 100644
--- a/libide/preferences/ide-preferences-perspective.c
+++ b/libide/preferences/ide-preferences-perspective.c
@@ -720,6 +720,8 @@ ide_preferences_perspective_add_custom (IdePreferences *preferences,
       return 0;
     }
 
+  gtk_widget_set_visible (widget, TRUE);
+
   if (IDE_IS_PREFERENCES_BIN (widget))
     container = IDE_PREFERENCES_BIN (widget);
   else