The background blur widget does not render in the correct position in PIE when it is within a retainer box. It's likely that we're not applying the retainer window's offset properly when calling FSlateDrawElement::MakePostProcessPass.

Steps to Reproduce
  1. Create a UserWidget with a Canvas Panel, a Retainer Box anchored to take up the full panel, and a Background Blur widget within the retainer
  2. Start PIE. Note that the blur will be offset by the offset of the viewport within the editor

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Won't Fix
ComponentUE - Editor - UI Systems - Slate
Affects Versions4.234.24
CreatedOct 10, 2019
ResolvedAug 27, 2021
UpdatedAug 27, 2021