Changing navigation rule breaks scrollbox rendering

Development Programming & Scripting UI
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1

Hi,

we are in the process of migrating to 5.8.

Unfortunately we’ve encountered some issues with our widgets inside horizontal scrollboxes in 5.8 being cut off.

Confusingly, I was able to reproduce the issue in a minimal case by just changing the navigation rules of the scrollbox.

Repro Project is attached.

Please advise.

Regards,

Max

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2

Steps to Reproduce

  • Load the Reproduction project
  • Open the NewWidgetBlueprint
  • Select the scroll box
  • set any navigation option to custom
  • compile the widget
  • see half the widget disappear
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3

Hi,

This should be fixed in CL#55773401. Basically, SScrollPanel::OnPaint needs to be updated to use the render bounds instead of the hit test bounds:

const FSlateRect BoundingRect = ScrollBoxGeometry.GetRenderBoundingRect();The full change linked above adds a CVar as well to revert to the old behavior, if you want to integrate that directly. Let us know if you run into any issues!

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