Merge lp:~brunonova/ubuntu/precise/software-properties/lp1075537 into lp:ubuntu/precise-proposed/software-properties

[Bruno Nova]

Fix for bug LP: #1075537 (which was fixed in Saucy) "backported" to Precise.

I tested this quickly in Virtualbox, and it seems to be working (the fix is trivial).

To test it, just run the fixed version of software-properties-gtk, change something in the software sources (the "Revert" button should become enabled), and close.
A dialog allowing the apt cache to be refreshed should appear.

I didn't change the changelogs or anything else in debian/*.

=== modified file 'softwareproperties/gtk/SoftwarePropertiesGtk.py'
--- softwareproperties/gtk/SoftwarePropertiesGtk.py	2012-07-18 09:28:10 +0000
+++ softwareproperties/gtk/SoftwarePropertiesGtk.py	2013-12-06 22:50:38 +0000
@@ -747,6 +747,7 @@
     """The config was changed and now needs to be saved and reloaded"""
     apt.apt_pkg.init_config()
     self.button_revert.set_sensitive(True)
+    self.modified_sourceslist = True
 
   def on_keys_modified(self):
     """ The apt keys have changed and need to be redisplayed """
@@ -759,6 +760,7 @@
     self.show_isv_sources()
     self.show_cdrom_sources()
     self.button_revert.set_sensitive(True)
+    self.modified_sourceslist = True
 
   def on_auth_failed(self):
     """ send when the authentication failed """