URichTextBlock::UpdateStyleData() does not check whether DecoratorClasses already had any specificed DecoratorClass. So every time you turn UMG on and off from the Viewport, Decorator Classes will increase indefinitely.

I propose that we add check code to a following code ( ex. URichTextBlock::GetDecoratorByClass )


void URichTextBlock::UpdateStyleData()void URichTextBlock::UpdateStyleData()

if (!ResolvedClass->HasAnyClassFlags(CLASS_Abstract))
   URichTextBlockDecorator* Decorator = NewObject<URichTextBlockDecorator>(this, ResolvedClass); 


Steps to Reproduce
  1. Create DecoratorClasse based on URichTextBlockImageDecorator
  2. Create WBP
  3. add RichTextBlock to 2
  4. set 1 to DecoratorClasse of 3
  5. PIE
  6. call Add to viewport to 2 
  7. call Remove from parent to 2
  8. call add to viewport to 2

result : DecoratorClasses of RichTextBlock has 2 instances.

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ComponentUE - Editor - UI Systems
Affects Versions4.264.27
Target Fix5.0
Fix Commit17830851
CreatedJul 29, 2021
ResolvedOct 15, 2021
UpdatedNov 30, 2021
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