blocksVisibility method

bool blocksVisibility()

Returns true if this node represents root of was imported by reference

Implementation

bool blocksVisibility() {
  visibilityBlocks ??= 0;
  return visibilityBlocks != 0;

//2.5.3 20151120
// Node.prototype.blocksVisibility = function () {
//     if (this.visibilityBlocks == null) {
//         this.visibilityBlocks = 0;
//     }
//     return this.visibilityBlocks !== 0;
// };
}