[gnome-news/wip/gbsneto/improvements: 2/2] app: improve about dialog

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit d28790d4f030e93181545eb990a2a18aa1a771ac
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Thu Mar 3 02:01:17 2016 -0300

    app: improve about dialog
    
    Set it modal to the parent window. Also, avoid accessing
    a private field from the parent application.

 gnomenews/about.py       |    3 ++-
 gnomenews/application.py |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gnomenews/about.py b/gnomenews/about.py
index ec908c1..d29e931 100644
--- a/gnomenews/about.py
+++ b/gnomenews/about.py
@@ -20,7 +20,8 @@ class AboutDialog(Gtk.AboutDialog):
     def __init__(self, parent):
         Gtk.AboutDialog.__init__(self)
         self.parent = parent
-        self.set_transient_for(self.parent._window)
+        self.set_modal(True)
+        self.set_transient_for(parent)
         self.set_artists(self._read_file("ARTISTS"))
         self.set_authors(self._read_file("AUTHORS"))
         self.set_copyright("Copyright © 2015 GNOME Foundation")
diff --git a/gnomenews/application.py b/gnomenews/application.py
index cd4e00f..d748cf3 100644
--- a/gnomenews/application.py
+++ b/gnomenews/application.py
@@ -80,7 +80,7 @@ class Application(Gtk.Application):
             self._about_dialog = None
 
         if not self._about_dialog:
-            self._about_dialog = AboutDialog(self)
+            self._about_dialog = AboutDialog(self._window)
 
         self._about_dialog.connect("destroy", on_destroy)
         self._about_dialog.present()