Add StartNoticeWhoGets, EndNoticeWhoGets events to allow upcoming TagSub plugin to do extra inbox delivery.

EVENTS.txt

@@ -1131,3 +1131,11 @@ StartActivityObjectOutputJson: Called at start of JSON output generation for Act
 EndActivityObjectOutputJson: Called at end of JSON output generation for ActivityObject chunks: the array has not yet been filled out.
 - $obj ActivityObject
 - &$out: array to be serialized; you're free to modify it
+
+StartNoticeWhoGets: Called at start of inbox delivery prep; plugins can schedule notices to go to particular profiles that would otherwise not have reached them. Canceling will take over the entire addressing operation. Be aware that output can be cached or used several times, so should remain idempotent.
+- $notice Notice
+- &$ni: in/out array mapping profile IDs to constants: NOTICE_INBOX_SOURCE_SUB etc
+
+EndNoticeWhoGets: Called at end of inbox delivery prep; plugins can filter out profiles from receiving inbox delivery here.  Be aware that output can be cached or used several times, so should remain idempotent.
+- $notice Notice
+- &$ni: in/out array mapping profile IDs to constants: NOTICE_INBOX_SOURCE_SUB etc

classes/Notice.php

@@ -812,6 +812,9 @@ class Notice extends Memcached_DataObject
 
         $ni = array();
 
+        // Give plugins a chance to add folks in at start...
+        if (Event::handle('StartNoticeWhoGets', array($this, &$ni))) {
+
             foreach ($users as $id) {
                 $ni[$id] = NOTICE_INBOX_SOURCE_SUB;
             }
@@ -849,6 +852,10 @@ class Notice extends Memcached_DataObject
                 }
             }
 
+            // Give plugins a chance to filter out...
+            Event::handle('EndNoticeWhoGets', array($this, &$ni));
+        }
+
         if (!empty($c)) {
             // XXX: pack this data better
             $c->set(Cache::key('notice:who_gets:'.$this->id), $ni);