code: function() {
          var me = this,
              lockedView = me.lockedGrid.getView(),
              lockedViewEl = lockedView.el.dom,
              spacerHeight = (me.normalGrid.headerCt.tooNarrow ? Ext.getScrollbarSize().height : 0);
  
          // If locked view is configured to scroll horizontally, and it overflows horizontally, then we do not need the spacer
          if (lockedView.scrollFlags.x && lockedViewEl.scrollWidth > lockedViewEl.clientWidth) {
              spacerHeight = 0;
          }
  
          lockedView.el.dom.style.borderBottomWidth = spacerHeight + 'px';
  
          // Legacy IE browsers which cannot be forced to use the sensible border box model.
          // We have to account in the element's style height for flip-flopping border width
          if (!Ext.isBorderBox) {
              lockedView.el.setHeight(lockedView.lastBox.height);
          }
      }
docs: Due to automatic component border setting using inline style, to create the scrollbar-replacing bottom border, we have to postprocess the locked view *after* render. If there are visible normal columns, we do need the fat bottom border.