Missing coverage that VkBufferImageCopy doesn't touch padding bytes.

[Kangz]

While implementing tests for WebGPU conformance testing, we found conformant Vulkan implementations that overwrote the padding bytes in VkBufferImageCopy in between rows or images (when the rowPitch is larger than a row size of the copy, or the same for imageHeight).

This means that VK-GL-CTS is probably missing coverage of this, and should be updated to check that padding bytes aren't touched in copies from images to buffers.

See https://github.com/KhronosGroup/Vulkan-Docs/issues/1822 for more context.

[mnetsch]

I've created an internal issue for this, it might take a while for Khronos contractors to implement

[mnetsch]

Thank you for your report