Simplify disabling checkbox

app/helpers/groups_helper.rb

@@ -3,6 +3,10 @@ module GroupsHelper
     can?(current_user, :change_visibility_level, group)
   end
 
+  def can_change_share_with_group_lock?(group)
+    can?(current_user, :change_share_with_group_lock, group)
+  end
+
   def group_icon(group)
     if group.is_a?(String)
       group = Group.find_by_full_path(group)
@@ -65,14 +69,6 @@ module GroupsHelper
       { group_name: group.name }
   end
 
-  def share_with_group_lock_disabled
-    return false unless @group.has_parent?
-    return false unless @group.parent.share_with_group_lock?
-    return false unless @group.share_with_group_lock?
-    return false if     @group.has_owner?(current_user)
-    return true
-  end
-
   def share_with_group_lock_help_text
     return default_help                          unless @group.has_parent?
     return default_help                          unless @group.parent.share_with_group_lock?

app/views/groups/edit.html.haml

@@ -34,7 +34,7 @@
         .col-sm-10
           .checkbox
             = f.label :share_with_group_lock do
-              = f.check_box :share_with_group_lock, disabled: share_with_group_lock_disabled
+              = f.check_box :share_with_group_lock, disabled: !can_change_share_with_group_lock?(@group)
               %strong
                 - group_link = link_to @group.name, group_path(@group)
                 = s_("GroupSettings|Prevent sharing a project within %{group} with other groups").html_safe % { group: group_link }