Description

Adding components in an Actor then undoing them after an action in the Viewport, leaves sub-components behind.

This is a regression from 4.19.2 (CL-4033788). This issue was reported and tested in 4.20.1 (CL-4233996). It was reproduced in Main 4.21 (CL-4280116)

Steps to Reproduce
  1. Open the UE4 Editor and create a blank project
  2. Create an Actor Blueprint and add it to the Level
  3. Select the Actor and add a "Directional Light" component in the details panel.
  4. Add a "Point Light" component in the details panel as well
  5. Select one of the lights
  6. Move the selected light in the Viewport
  7. Select "Edit/Undo Move Components" or use Ctrl-Z

Results: The two lights now have "BillboardComponent_1" and "BillboardComponent_2" sub-components visible in the details panel

Expected: The light is moved back to its location without added sub-components

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Cannot Reproduce
ComponentUE - Gameplay
Affects Versions4.20.14.21
Target Fix4.21
Fix Commit4455340
Main Commit4457235
Release Commit4455340
CreatedAug 14, 2018
ResolvedOct 12, 2018
UpdatedOct 12, 2018
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