fix stack overflow on some ui and syntax errors

Extensions/Mouseover/XPerl.lua

@@ -11,17 +11,26 @@ local CleveRoids = _G.CleveRoids or {}
 local Extension = CleveRoids.RegisterExtension("XPerl")
 Extension.RegisterEvent("ADDON_LOADED", "OnLoad")
 
+-- Re-entrancy guard to prevent stack overflow
+local isProcessing = false
+
 -- X-Perl uses XPerl_PlayerTip(unitid) for OnEnter and XPerl_PlayerTipHide() for OnLeave
 -- We hook these functions to track mouseover
 
 function Extension.OnEnter(unitid)
+    if isProcessing then return end
     if unitid and unitid ~= "" then
+        isProcessing = true
         CleveRoids.SetMouseoverFrom("xperl", unitid)
+        isProcessing = false
     end
 end
 
 function Extension.OnLeave()
+    if isProcessing then return end
+    isProcessing = true
     CleveRoids.ClearMouseoverFrom("xperl")
+    isProcessing = false
 end
 
 function Extension.OnLoad()