Backport event TRIGGER:x support from mainline

https://github.com/WeakAuras/WeakAuras2/commit/3ab97ddce48e6ba46b49a7fdb36a4efa2d1c935b#diff-06c2316487fbaca0f482a162e763ad96ce5624a012a6d5417653b2068d144dfdR119

WeakAuras/BuffTrigger2.lua

@@ -64,6 +64,8 @@ local timer = WeakAuras.timer
 local BuffTrigger = {}
 local triggerInfos = {}
 
+local watched_trigger_events = Private.watched_trigger_events
+
 -- keyed on unit, debuffType, spellname, with a scan object value
 -- scan object: id, triggernum, scanFunc
 local scanFuncName = {}
@@ -1348,6 +1350,13 @@ local function UpdateTriggerState(time, id, triggernum)
     triggerInfo.nextScheduledCheckHandle = nil
     triggerInfo.nextScheduledCheck = nil
   end
+  
+  -- if the trigger has updated then check to see if it is flagged for WatchedTrigger and send to queue if it is
+  if updated then
+    if watched_trigger_events[id] and watched_trigger_events[id][triggernum] then
+      Private.AddToWatchedTriggerDelay(id, triggernum)
+    end
+  end
 
   return updated
 end