Essentially, this memory leak should be counted in the UI section, but it is counted in the SceneRender section.
This seems to be due to the behavior of MemStackAllocator and FixedSizeAllocator.

The following workaround solves this problem. (Probably not a suitable solution)

void FSlateBatchData::MergeRenderBatches()

//		TArray<TPair<int32, int32>, TInlineAllocator<100, TMemStackAllocator<>>> BatchIndices;
		TArray<TPair<int32, int32>, TInlineAllocator<100> > BatchIndices;

			SCOPED_NAMED_EVENT_TEXT("Slate::SortRenderBatches", FColor::Magenta);

Steps to Reproduce
  1. Open attached project on 4.25.3 engine[Image Removed]
  2. Build package for win64
  3. Launch the packaged game with -LLM command-line option
  4. After launching the game, enter "stat LLMFULL" console command
  5. see stats


SceneRender section in stats keeps increasing


RetainerBoxMemoryLeak.mp4[Image Removed]


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ComponentTools - Slate
Affects Versions4.254.25.3
Target Fix4.25.4
Fix Commit14175502
CreatedAug 20, 2020
ResolvedSep 16, 2020
UpdatedSep 16, 2020