IE11 - unable to drag and drop any text or image from within Alloy Editor

• Type: Regression Bug
• Status: Closed
• Resolution: Won't Fix
• Affects Version/s: 7.0.X, 7.1.X, Master
• Fix Version/s: None
• Component/s: Alloy Editor, Frontend Infrastructure > WYSIWYG
• Labels:
  • ee-ts
• Fix Priority: 4

Steps to reproduce:

1. On IE11
2. Navigate to CP > Add web content
3. Add text and/or an image in Content section
4. highlight some text or image
5. Click and drag the highlighted item to another text location

Expected Result:
Highlighted item is moved to the designated text location

Actual Result:
Nothing happens
Peek 2019-02-14 15-55.webm

Reproduced on:
IE11 + Tomcat 9.0.10 + MariaDB 10.2
Portal master GIT ID: 56f33b135e896fad1760b0d6620b845519d28c28.