[sixel_delete] don't scribble beyond pile rendering vector #1534

src/lib/sixel.c

@@ -505,8 +505,8 @@ int sixel_delete(const notcurses* nc, const ncpile* p, FILE* out, sprixel* s){
 //fprintf(stderr, "%d] %d %p\n", s->id, s->invalidated, s->n);
   (void)nc;
   (void)out;
-  for(int yy = s->movedfromy ; yy < s->movedfromy + s->dimy ; ++yy){
-    for(int xx = s->movedfromx ; xx < s->movedfromx + s->dimx ; ++xx){
+  for(int yy = s->movedfromy ; yy < s->movedfromy + s->dimy && yy < p->dimy ; ++yy){
+    for(int xx = s->movedfromx ; xx < s->movedfromx + s->dimx && xx < p->dimx ; ++xx){
       struct crender *r = &p->crender[yy * p->dimx + xx];
       if(!r->sprixel){
         r->s.damaged = 1;