Allow users to unsubscribe via email address, without logging in. Fixes bug #11559.

docs/changelog/7.x.x.txt

@@ -23,6 +23,7 @@
  - fixed #11549: Shortcut Asset cannot override Page Layout
  - added #11502: Gallery: Allow specification of location when uploading ZIP archives
  - added #11517: Gallery: Sorting of files uploaded in zip archives
+ - fixed #11559: Unsubscribe Link in Emails
 
 7.9.4
  - We're shipping underscore.js now for its suite of extremely handy utility

docs/upgrades/upgrade_7.9.4-7.9.5.pl

@@ -36,6 +36,7 @@ modifySortItems( $session );
 fixRequestForApprovalScratch($session);
 addRejectNoticeSetting($session);
 updateGroupGroupingsTable($session);
+installNewCSUnsubscribeTemplate($session);
 
 finish($session); # this line required
 
@@ -57,6 +58,15 @@ sub addRejectNoticeSetting {
     print "DONE!\n" unless $quiet;
 }
 
+#----------------------------------------------------------------------------
+sub installNewCSUnsubscribeTemplate {
+    my $session = shift;
+    print "\tAdding new unsubscribe template to the CS... " unless $quiet;
+    $session->db->write(q|ALTER TABLE Collaboration ADD COLUMN unsubscribeTemplateId CHAR(22) NOT NULL|);
+    $session->db->write(q|UPDATE Collaboration set unsubscribeTemplateId='default_CS_unsubscribe'|);
+    print "DONE!\n" unless $quiet;
+}
+
 #----------------------------------------------------------------------------
 # Add keys and indicies to groupGroupings to help speed up group queries
 sub updateGroupGroupingsTable {