This is a regression as it does not occur in 4.14.3 at CL 3248269

Update chris.wood:
I think this might be a wobble caused by floating point errors in SMenuAnchor::Tick()

Steps to Reproduce
  1. Create a new BP FirstPerson project on Mac
  2. Resize window so that it does NOT fill the entire screen
  3. Select a cube in the viewport
  4. In the details panel click on the dropdown for Static Mesh

Result: The dropdown consistently jitters causing it to look blurry.

Repro note (chris.wood):
Problem wasn't with specific menus or circumstances, just when the precise layout meant a floating point error caused a one pixel jitter. It could happen to any menus but was common enough for me to easily repro. Didn't see it happening with right-click context menus. Happened with maybe 25-50% of combo/anchored menus.

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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-40293 in the post.

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Affects Versions4.15
Target Fix4.15
Fix Commit3262125
Main Commit3389599
Release Commit3262125
CreatedJan 6, 2017
ResolvedJan 18, 2017
UpdatedApr 27, 2018
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