Re-initiating drag on existing elements doesn't work in Firefox

[kineticquant]

In the app.js file, specifically for function dragMoveStart, the event.dataTransfer.setData method is supposed to enable Firefox users to reposition existing elements on the canvas, but instead the elements disappear entirely.

Right now the functionality is only working on Chromium-based browsers.

function dragMoveStart(event) { event.dataTransfer.setData("text/plain", null); // for Firefox event.target.classList.add("dragging"); event.dataTransfer.effectAllowed = "move"; this.offsetX = event.clientX - event.target.offsetLeft; this.offsetY = event.clientY - event.target.offsetTop; }