This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
When making changes to the properties of the paint mode (paint color, brush settings, etc.) the actions are not logged into the undo history and therefore cannot be undone.
Attached is the screenshot and log from the 4.13 build.
Setup:
Open a new blank project.
Repro:
Expected Result:
Able to make changes and undo them in editor.
Result:
Editor does not recognize changes being made and does not log them into the undo history.
Frequency:
10/10
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-36628 in the post.