Default visibility not respected for topic/events for group & visibility field

Problem

With the new Group & Visibility section and group widget the default content visibility that you can set at /admin/config/opensocial/visibility is no longer respected. It always defaults to 'community'.

You can test this by going to /admin/config/opensocial/visibility and setting the default visibility to 'public' and then creating a topic.

Furthermore the logic in the SocialGroupSelectorWidget::validateGroupSelection is also flawed. It sends a "checked" command for every option so the last one (community) is always selected even when "public" is the default. You can see this when you first select a group and the visibility is set to group. Then setting the group selection to "None". You'd expect the visibility to go to "Public" but it goes to "Community".

Solution

• Find out and fix why the default visibility is not respected.
• Apply the patch of #2 as a workaround for SocialGroupSelectorWidget::validateGroupSelection