Stop mouse event to prevent accidental trigger of nested tp-sortable elements.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tp/tp-sortable",
-  "version": "2.1.1",
+  "version": "2.1.2",
   "description": "",
   "main": "tp-sortable.js",
   "scripts": {

tp-sortable.js

@@ -95,6 +95,7 @@ class TpSortable extends EventHelpers(LitElement) {
   _onMouseDown(e) {
     this._longPressTarget = closest(e.composedPath()[0], this.handle || this.selector, true);
     if (this._longPressTarget) {
+      e.stopPropagation();
       this._startX = e.detail.x;
       this._startY = e.detail.y;
       const path = e.composedPath();