drop ncplane_erase() from slider

src/demo/fallin.c

@@ -183,6 +183,6 @@ int fallin_demo(struct notcurses* nc){
   assert(ncvisual_decode(ncv, &averr) == NULL);
   assert(averr == AVERROR_EOF);
   ncvisual_destroy(ncv);
-  ncplane_pulse(notcurses_stdplane(ncv), &demodelay, pulser);
+  ncplane_pulse(notcurses_stdplane(nc), &demodelay, pulser);
   return ret;
 }

src/demo/sliding.c

@@ -159,7 +159,6 @@ int sliding_puzzle_demo(struct notcurses* nc){
   int wastey = ((maxy - 2) - (CHUNKS_VERT * chunky)) / 2;
   int wastex = ((maxx - 2) - (CHUNKS_HORZ * chunkx)) / 2;
   struct ncplane* n = notcurses_stdplane(nc);
-  ncplane_erase(n);
   const int chunkcount = CHUNKS_VERT * CHUNKS_HORZ;
   struct ncplane** chunks = malloc(sizeof(*chunks) * chunkcount);
   if(chunks == NULL){

src/demo/witherworm.c

@@ -443,7 +443,7 @@ int witherworm_demo(struct notcurses* nc){
     NULL
   };
   const char** s;
-  const int steps[] = { 0, 0x10040, 0x100, 0x100, 0x10001, };
+  const int steps[] = { 0, 0x10040, 0x20110, 0x120, 0x12020, };
   const int starts[] = { 0, 0x10101, 0x004000, 0x000040, 0x400040, };
 
   struct ncplane* n = notcurses_stdplane(nc);
@@ -472,9 +472,8 @@ int witherworm_demo(struct notcurses* nc){
       y = 0;
       x = 0;
       ncplane_set_bg_rgb(n, 20, 20, 20);
-      do{ // we fill up the entire screen, however large, walking our strtable
+      do{ // we fill up the screen, however large, bouncing around our strtable
-        s = strs;
+        s = strs + random() % ((sizeof(strs) / sizeof(*strs)) - 1);
-        for(s = strs ; *s ; ++s){
         size_t idx = 0;
         ncplane_cursor_yx(n, &y, &x);
 // fprintf(stderr, "%02d %s\n", y, *s);
@@ -514,7 +513,6 @@ int witherworm_demo(struct notcurses* nc){
           ++egcs_out;
         }
         rgb += step;
-        }
       }while(y < maxy && x < maxx);
       struct ncplane* math = mathplane(nc);
       if(math == NULL){