Avoid double multiple runs

refreshVP.sh

@@ -19,6 +19,7 @@
 timeout=10
 DEBUG=true
 interaction=true
+echo "" > /var/log/vp.log
 log(){
     if $DEBUG
     then
@@ -69,11 +70,18 @@ screens=$(xrandr | grep " connected" | cut -f 1 -d ' ' \
     | sed -e 's/ /\n/g' | grep -v "\<$MAIN_SCREEN\>")
 
 log  "SCREENS '$screens'"
+log  "all '$screens$MAIN_SCREEN'"
+log  "cat '$(cat /tmp/vp-screens)'"
 if [ -z "$screens$MAIN_SCREEN" ]
 then
     log  "noscreens exiting on $(date)"
     exit
+elif [ "$screens$MAIN_SCREEN" == "$(cat /tmp/vp-screens)" ]
+then
+    log "no changes exiting on $(date)"
+    exit
 fi
+echo "$screens$MAIN_SCREEN" > /tmp/vp-screens
 
 clone(){
     # Auto detect best resolution