bug: Memory Leak with Clusterize.js "Detached Elements"

[viniciuscenci]

Current Behavior

When using clusterize.js + ionicons module, ionicons keeps references in memory, the list of "Detached Elements" keeps growing.

Expected Behavior

Elements to be Garbage Collected.

Steps to Reproduce

1. Create a instance of Clusterize.js with 1000 items, using the tag <ion-icon name="arrow-forward-circle-outline"></ion-icon>

2. Filter the list using the button Or even just by scrolling the list...

3. Check the "Detached Elements" (in Edge) or in Chrome

Code Reproduction URL

https://codepen.io/viniciuscenci/pen/RwvvrGL

Additional Information

In the provided code, by replacing the <ion-icon> tag with regular <svg> or svg references, the problem is solved, but the convenience of <ion-icon> tag is lost =(

[!NOTE] It get event worst when there is multiple icons, divs and other elements inside de list item, since the number of detached nodes is basically multiplied.