Locking the mouse to a widget covered by a Retainerbox locks it in a different position in the standalone/packaging application than in PIE.  This does not happen if RetainerBox is disabled and the mouse is locked in the correct position. Also, selecting focus outside the viewport locks the mouse in the correct position. 

Steps to Reproduce
  1. Open the attached repro project
  2. Play in editor
  3. Move mouse cursor on the bottom position in scroll box, then move scroll and mouse lock 
  4. Stop PIE
  5. Play in standalone 
  6. When the mouse cursor is moved to the bottom of the scroll box, the mouse lock is locked at a position well off the scroll box

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ComponentUE - Editor - UI Systems - UMG
Affects Versions5.25.3
Target Fix5.4
Fix Commit30886107
Main Commit30886114
CreatedJan 9, 2024
ResolvedJan 25, 2024
UpdatedFeb 15, 2024
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