docs: public void setPanelHeight(int val) {
          if (getPanelHeight() == val) {
              return;
          }
  
          mPanelHeight = val;
          if (!mFirstLayout) {
              requestLayout();
          }
  
          if (getPanelState() == PanelState.COLLAPSED) {
              smoothToBottom();
              invalidate();
              return;
          }
      }