https://bugs.documentfoundation.org/show_bug.cgi?id=172836

V Stuart Foote <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #5 from V Stuart Foote <[email protected]> ---
Going to call this => WFM, seems it is a resource issue with the shared
graphics memory. Some dev might have the cycles to dig into the memory
cache/flush and vk paint/erase/draw sequence as the font previews are scrolled,
but this issue goes away when not running skia/Vulkan rendering which will
become default at 26.2.5.

For completeness, finally got a moment to get onto my workstation with a more
robust dGPU and more resources.

No issue (26.2.4, or 26.8.0.1) with rendering of the font list with previews
scrolling it up or down by its "thumb" with this mainstream nVidia dGPU with
sufficient resources, 8Gb of physical/48Gb shared display RAM: 

=-dxdiag.exe-=

Driver Name:
C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_55661cb7fab2ea8e\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_55661cb7fab2ea8e\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_55661cb7fab2ea8e\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nvdd.inf_amd64_55661cb7fab2ea8e\nvldumdx.dll
 Driver File Version: 32.00.0015.9595 (English)
      Driver Version: 32.0.15.9595
         DDI Version: 12
  Adapter Attributes:
HARDWARE_TYPE_GPU,D3D11_GRAPHICS,D3D12_GRAPHICS,D3D12_CORE_COMPUTE,D3D12_GENERIC_ML,D3D12_GENERIC_MEDIA
      Feature Levels: 12_2,12_1,12_0,11_1,11_0,10_1,10_0,9_3,9_2,9_1,1_0_CORE
        Driver Model: WDDM 3.2

=-VulkanInfo.exe-=

Device Properties and Extensions:
=================================
GPU0:
VkPhysicalDeviceProperties:
---------------------------
        apiVersion        = 1.4.329 (4211017)
        driverVersion     = 595.95.0.0 (2497167360)
        vendorID          = 0x10de
        deviceID          = 0x2803
        deviceType        = PHYSICAL_DEVICE_TYPE_DISCRETE_GPU
        deviceName        = NVIDIA GeForce RTX 4060 Ti
        pipelineCacheUUID = 97b7c0f3-ee35-b817-1a38-098fb1dabde0


So, guess it really is simply a resource issue with Vulkan rendering, for this
iGPU, 0x8a52 runs out of its 128Mb physical/8Gb shared of display memory
redrawing before we flush its buffers.

deviceID          = 0x8a52
deviceType        = PHYSICAL_DEVICE_TYPE_INTEGRATED_GPU
deviceName        = Intel(R) Iris(R) Plus Graphics

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