If the user creates a widget and adds an animation for this widget and then deletes the widget the key frames will not be removed from the animation timeline.
Head over to the existing Questions & Answers thread and let us know what's up.
|Component||UE - Editor - UI Systems|
|Affects Versions||4.7.2, 4.8|
|Created||Mar 5, 2015|
|Resolved||Jul 29, 2016|
|Updated||Apr 27, 2018|