From ae7c7ff3820d60d906ca5a656560384b76837bbb Mon Sep 17 00:00:00 2001
From: Daniel Hahler <git@thequod.de>
Date: Tue, 7 Jul 2015 13:01:53 +0200
Subject: [PATCH] awful.tag: emit property:: signals only on change

This can have a significant performance impact in case you listen to the
property::hide signal to auto-hide tags for example.
---
 lib/awful/tag.lua | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/awful/tag.lua b/lib/awful/tag.lua
index 46a9ea8d..93ad2ae2 100644
--- a/lib/awful/tag.lua
+++ b/lib/awful/tag.lua
@@ -598,8 +598,10 @@ function tag.setproperty(_tag, prop, value)
     if not data.tags[_tag] then
         data.tags[_tag] = {}
     end
-    data.tags[_tag][prop] = value
-    _tag:emit_signal("property::" .. prop)
+    if data.tags[_tag][prop] ~= value then
+        data.tags[_tag][prop] = value
+        _tag:emit_signal("property::" .. prop)
+    end
 end
 
 --- Tag a client with the set of current tags.