Comment 17 for bug 782953

Here's a quick (and temporary) workaround to make the DialogCacheOutdated appear on close if the options were changed, for the GTK version, as a patch for the software-properties source package.

Basically, instead of checking "self.modified_sourceslist" (that prevents the dialog from appearing), with the patch it checks if the revert button is enabled. (dirty workaround, but it seems to work).

Still, "self.modified_sourceslist" needs to be fixed, and this doesn't "refresh" the Software Center (I think).
I hope the patch is correct.