don't call ncplane_dim_yx() in notcurses_render_internal

src/lib/render.c

@@ -297,8 +297,9 @@ notcurses_render_internal(notcurses* nc, struct crender* rvec){
   if(reshape_shadow_fb(nc)){
     return -1;
   }
-  int dimy, dimx;
-  notcurses_term_dim_yx(nc, &dimy, &dimx);
+  // don't use ncplane_dim_yx()/ncplane_yx() here, lest we deadlock
+  int dimy = nc->stdscr->leny;
+  int dimx = nc->stdscr->lenx;
   cell* fb = malloc(sizeof(*fb) * dimy * dimx);
   for(int y = 0 ; y < dimy ; ++y){
     for(int x = 0 ; x < dimx ; ++x){
@@ -677,12 +678,12 @@ int notcurses_render(notcurses* nc){
     bytes = notcurses_rasterize(nc, crender);
   }
   free(crender);
-  int dimy, dimx;
-  notcurses_resize(nc, &dimy, &dimx);
   clock_gettime(CLOCK_MONOTONIC_RAW, &done);
   update_render_stats(&done, &start, &nc->stats, bytes);
   ret = bytes >= 0 ? 0 : -1;
   pthread_cleanup_pop(1);
+  int dimy, dimx;
+  notcurses_resize(nc, &dimy, &dimx);
   return ret;
 }