Fix tooltips flickering on Button tooltips (Fixes #240)

Author: raethkcj

TipHooker.lua

@@ -3,9 +3,13 @@
 local handler
 local enabled = false
 
+local runningHandler = {}
+
 local RunHandler = function(tooltip)
-	if enabled then
+	if enabled and not runningHandler[tooltip] then
+		runningHandler[tooltip] = true
 		handler(tooltip)
+		runningHandler[tooltip] = nil
 	end
 end
 
@@ -25,6 +29,7 @@ end
 local directUpdateTypes = {
 	["GameTooltip"] = true,
 	["CheckButton"] = true,
+	["Button"] = true,
 }
 
 local function HandleTooltipSetItem(tooltip)