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Memory overload with HDRI thumbnails in File Browser Blender 2.91.2 and 2.92 Beta
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09
RAM 32GB

Blender Version
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: rB5be9ef417703
Broken: version: 2.92.0 Beta, branch: master, commit date: 2021-01-28 23:06, hash: rB213f8294b5c8

Short description of error
When opening a folder containing a lot of HDRI's, especially high resolution ones, like 14K, and in thumbnail preview. Blender overflows the memory trying to generate thumbnails. It's like a memory leak.