MAGETWO-66640: Fix a bug resulting in incorrect offsets with dynamic row drag-n-drop functionality #7161

Author: vrann

app/code/Magento/Ui/view/base/web/js/dynamic-rows/dnd.js

@@ -136,8 +136,8 @@ define([
             drEl.instanceCtx = this.getRecord(originRecord[0]);
             drEl.eventMousedownY = isTouchDevice ? event.originalEvent.touches[0].pageY : event.pageY;
             drEl.minYpos =
-                $table.offset().top - originRecord.offset().top + $table.find('thead').outerHeight();
-            drEl.maxYpos = drEl.minYpos + $table.find('tbody').outerHeight() - originRecord.outerHeight();
+                $table.offset().top - originRecord.offset().top + $table.children('thead').outerHeight();
+            drEl.maxYpos = drEl.minYpos + $table.children('tbody').outerHeight() - originRecord.outerHeight();
             $tableWrapper.append(recordNode);
 
             if (isTouchDevice) {