Method _leave

src/gridstack.ts:2989–3023

@internal called when item leaving our area by either cursor dropout event * or shape is outside our boundaries. remove it from us, and mark temporary if this was * our item to start with else restore prev node values from prev grid it came from.

(el: GridItemHTMLElement, helper?: GridItemHTMLElement)

   * our item to start with else restore prev node values from prev grid it came from.
   */
  protected _leave(el: GridItemHTMLElement, helper?: GridItemHTMLElement): void {
    helper = helper || el;
    const node = helper.gridstackNode;
    if (!node) return;

    // remove the scale of the helper on leave
    helper.style.transform = helper.style.transformOrigin = null;
    dd.off(el, 'drag'); // no need to track while being outside

    // this gets called when cursor leaves and shape is outside, so only do this once
    if (node._temporaryRemoved) return;
    node._temporaryRemoved = true;

    this.engine.removeNode(node); // remove placeholder as well, otherwise it's a sign node is not in our list, which is a bigger issue
    node.el = node._isExternal && helper ? helper : el; // point back to real item being dragged
    const sidebarOrig = node._sidebarOrig;
    if (node._isExternal) this.engine.cleanupNode(node);
    // Restore sidebar item initial size info to stay consistent when dragging between multiple grids
    node._sidebarOrig = sidebarOrig;

    if (this.opts.removable === true) { // boolean vs a class string
      // item leaving us and we are supposed to remove on leave (no need to drag onto trash) mark it so
      GridStack._itemRemoving(el, true);
    }

    // finally if item originally came from another grid, but left us, restore things back to prev info
    if (el._gridstackNodeOrig) {
      // console.log('leave delete _gridstackNodeOrig') // TEST
      el.gridstackNode = el._gridstackNodeOrig;
      delete el._gridstackNodeOrig;
    } else if (node._isExternal) {
      // item came from outside restore all nodes back to original
      this.engine.restoreInitial();
    }
  }

}