Check that cell is not wide right in render #362

src/lib/notcurses.c

@@ -1250,6 +1250,7 @@ int ncplane_putc_yx(ncplane* n, int y, int x, const cell* c){
       }
       cell_obliterate(n, candidate);
       cell_set_wide(candidate);
+      candidate->channels = c->channels;
     }
   }
   n->x += cols;

src/lib/render.c

@@ -279,7 +279,7 @@ paint(ncplane* p, cell* lastframe, struct crender* rvec,
       const cell* vis = &p->fb[nfbcellidx(p, y, x)];
       // if we never loaded any content into the cell (or obliterated it by
       // writing in a zero), use the plane's base cell.
-      if(vis->gcluster == 0){
+      if(vis->gcluster == 0 && !cell_wide_right_p(vis)){
         vis = &p->basecell;
       }
       // if we have no character in this cell, we continue to look for a

tests/render.cpp

@@ -122,7 +122,7 @@ TEST_CASE("RenderTest") {
     // should be nothing, having been stomped
     egc = notcurses_at_yx(nc_, 0, 3, &c.attrword, &c.channels);
     REQUIRE(egc);
-    CHECK(0 == strcmp(" ", egc));
+    CHECK(0 == strcmp("", egc));
     free(egc);
     cell_init(&c);