Tetris: take upper halves into account for PieceStuck()

src/tetris/stuck.h

@@ -6,6 +6,17 @@ bool PieceStuck() {
     int y, x;
     curpiece_->get_dim(&y, &x);
     while(x--){
+      ncpp::Cell piecec;
+      if(curpiece_->get_at(y - 1, x, &piecec) < 0){
+        throw TetrisNotcursesErr("get_at()");
+      }
+      if(!piecec.get().gcluster || piecec.get().gcluster == ' '){
+        continue;
+      }
+      const char* egc = curpiece_->get_extended_gcluster(piecec);
+      if(strcmp(egc, "▄") && strcmp(egc, "█")){
+        continue;
+      }
       int cmpy = y, cmpx = x; // need game area coordinates via translation
       curpiece_->translate(*board_, &cmpy, &cmpx);
       ncpp::Cell c;