transsetter.sh: only apply opacity when a window is created, not every run

transsetter.sh

@@ -32,17 +32,20 @@ if ! which xshove > /dev/null; then
 fi
 
 wlist=$(mktemp)
-
+oldwlist=$(mktemp)
 while true; do
   xshove > $wlist
   while read wprop; do
     wid=$(echo ${wprop} | awk '{print $1}')
+    if ! grep $wid $oldwlist > /dev/null; then
       wclass=$(echo ${wprop} | awk '{print $3}')
 	  	if [ "$wclass" = "${geditor}" ]; then
 		  	$setter -i 0x$wid ${opacity} > /dev/null
 		  elif [ "${wclass}" = "${termprog}" ]; then
 			  $setter -i 0x$wid ${opacity} > /dev/null
 	    fi
+	  fi
   done < $wlist
+  cat $wlist > $oldwlist;
   sleep 0.2
 done