message: fix: reset default direction to upwards when all tips are hidden.
diff: @@ -315,5 +315,7 @@ export class TipChainState {
  console.log("hiding entire chain " + this._chainId)
  this.hideChain(this._handlers)
  this._handlers = [];
  + // reset default direction to upwards.
  + this._placement = 'top';
  }
  }
  