title: ExtJS -- grid rowwidget plugin creating widgets on scroll
body: <p>I have an ExtJS 6.5.1 app. I have a grid that uses the "rowwidget" plugin with a grid as the widget. If I scroll the parent grid all the way to the bottom then back to the top, it creates a duplicate widget for that row causing unexpected behavior.</p>
  
  <p><a href="https://fiddle.sencha.com/#fiddle/2k7q&amp;view/editor" rel="nofollow noreferrer">Here</a> is the fiddle.</p>
  
  <p>Steps to reproduce:
   1) Expand any row 
   2) scroll parent grid all the way to the bottom
   3) scroll back to top</p>
  
  <p>and you will notice the length of the widget component increasing meaning multiple instances are being created. After a while everything breaks and I get all sorts of errors.</p>