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Material preview not visible in selection list
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Description

System Information
Operating system: Linux-5.4.0-7634-generic-x86_64-with-debian-bullseye-sid 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.100

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-02 22:21, hash: rB5a13f682ee5f
Worked: version: 2.90.0 Alpha, branch: master, commit date: 2020-06-28 15:13, hash: rBb21ba5e57974

Short description of error
Materials preview does not appear in "Browse material to be linked" list.
It should show up at the left edge of the list.

Event Timeline

Ankit Meel (ankitm) renamed this task from Material Icons to Material preview not visible in selection list.Jul 4 2020, 4:01 PM
Ankit Meel (ankitm) changed the task status from Needs Triage to Confirmed.
Ankit Meel (ankitm) triaged this task as High priority.
Ankit Meel (ankitm) updated the task description. (Show Details)
Ankit Meel (ankitm) added a comment.EditedJul 4 2020, 4:04 PM

EDIT it seems to be introduced in a different commit from rB937d89afba36, so I'll make a new report about it

Error: Not freed memory blocks: 11, total unfreed memory 9.007629 MB
Data from SCE len: 128 0x600007764cf8
Data from SCE len: 528384 0x1203d6038
Data from SCE len: 3145728 0x126815038
Data from SCE len: 160 0x600003b35538
Data from SCE len: 786432 0x1217b4038
Data from SCE len: 196608 0x120458038
Data from SCE len: 49152 0x11fea4038
Data from SCE len: 12288 0x106ae3838
Data from SCE len: 3072 0x106a3c038
Data from SCE len: 320 0x124721338
Data from SCE len: 320 0x119b6d6d8

Just expand the list, and close it, and close blender.

rB937d89afba36 is the first bad commit.
CC @Julian Eisel (Severin)
Ignore the memory leak comment though. I'll make a new report about it.

Note that the memory leaks also appear when opening the preview panel. I'd assume the leak comes from the scene from the preview .blend file.

bad commit: rB3a59c184b98a729ccaa1261d1252e084167f7a32
got distracted while making the report..