1 files changed, 8 insertions, 0 deletions
diff --git a/main.c b/main.c
index ea85123..478d8d8 100644
--- a/main.c
+++ b/main.c
@@ -75,6 +75,7 @@ void rfbScheduleCopyRegion(rfbScreenInfoPtr rfbScreen,sraRegionPtr copyRegion,in
    while((cl=rfbClientIteratorNext(iterator))) {
      LOCK(cl->updateMutex);
      if(cl->useCopyRect) {
+       sraRegionPtr modifiedRegionBackup;
        if(!sraRgnEmpty(cl->copyRegion) && (cl->copyDX!=dx || cl->copyDY!=dy)) {
 	 sraRgnOr(cl->copyRegion,cl->modifiedRegion);
 	 sraRgnMakeEmpty(cl->copyRegion);
@@ -83,6 +84,13 @@ void rfbScheduleCopyRegion(rfbScreenInfoPtr rfbScreen,sraRegionPtr copyRegion,in
        cl->copyDX = dx;
        cl->copyDY = dy;
 
+       /* if there were modified regions, which are now copied: */
+       modifiedRegionBackup=sraRgnCreateRgn(cl->modifiedRegion);
+       sraRgnOffset(modifiedRegionBackup,dx,dy);
+       sraRgnAnd(modifiedRegionBackup,cl->copyRegion);
+       sraRgnOr(cl->modifiedRegion,modifiedRegionBackup);
+       sraRgnDestroy(modifiedRegionBackup);
+
        /* while(!sraRgnEmpty(cl->copyRegion)) */ {
 #ifdef HAVE_PTHREADS
 	 if(!cl->screen->backgroundLoop)