lit-virtualizer repeated use with LitElement - adds scroll window event listener more than once

[cintaccs]

In a LitElement component - render method: render() { return html<lit-virtualizer .items=${items} .renderItem=${this.listitem}>; } keeps adding:

A potential solution - seems to work but a bit "hacky" - VirtualScroller.js set container(container) method:

            this._containerRO.disconnect();
            this._containerSize = null;
            if (oldEl) {
                if (this._containerInlineStyle) {
                    oldEl.setAttribute('style', this._containerInlineStyle);
                }
                else {
                    oldEl.removeAttribute('style');
                }
                this._containerInlineStyle = null;
                if (oldEl === this._scrollTarget) {
                    oldEl.removeEventListener('scroll', this, { passive: true });
                    this._sizer && this._sizer.remove();
                }
            }
            else {                
                if (!window.scrollLitVirtual) {
                    console.log('window.scrollLitVirtual  setting scroll on window once');
                    addEventListener('scroll', this, { passive: true });
                    window.scrollLitVirtual = true;
                }
                // First time container was setup, add listeners only now.
            }

if (!window.scrollLitVirtual) { is the condition added to avoid continous scroll event listeners to be added. I have tried several ways to capture the window.scroll event on DisconnectedCallBack on the Lit-Element etc. but maybe because of the "this" handler reference - it is impossible (for me at least) to figure out a way to get rid of the event listeners no longer relevant. For whatever reason the garbage collection is not picking these up. It might be related to the way I switch between lit-element controls ... but maybe it is an issue for others too. I have tried just using the scroll directive - but it is the same issue also using the directive.

Anyone with the same issue? or a better way to avoid the hack?

[cintaccs]

Hi, Are any updates planned to the lit-virtualizer in the short/medium term? eventually with a fix to above.

[graynorton]

The code in this area has been significantly reworked, and I believe this issue should no longer occur. Please check against 0.7.0-pre.2 or later.