Dropzone CSS class is not implemented when dragging a portlet on Widget page

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.3.X, 7.4.3.7 CE GA7, 7.4.13 DXP U3, 7.4.3.8 CE GA8, 7.4.13 DXP U4, Master
• Component/s: Pages > Widget Pages
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-4-7310
  • liferay-update-dxp-3-7413
  • liferay-update-dxp-4-7310
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Fix Priority: 1
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/6873

Steps to reproduce:

1. Create a new widget page
2. Go to the site and open the Add Panel sidebar
3. Open the Chrome developer tool and search for "portlet-dropzone" class
4. Drag a new portlet in the sidebar (a web content for instance) without dropping it and check the dev tool

Expected result:

.yui3-dd-drop-active-valid class is added on .portlet-dropzone

 Actual result:

.yui3-dd-drop-active-valid is not added