f13bf270c6
If render engines dont specify `RE_USE_PREVIEW` / `bl_use_preview`, they wont pass the `ED_check_engine_supports_preview` test. That is mostly meant to tell blender this engine is capable of generating (Material) previews and if it isnt, they will skip generating button previews in `icon_preview_startjob_all_sizes`. There are already exceptions for type of IDs that can still generate previews (think Asset previews for Objects or Actions), so the same exception can be made for Images and Brushes as well (these previews will just befulled from the Image buffer, that should not rely on the engine whatsoever). We can also be permissive on Groups (they are treated similar to Objects). NOTE: this was reported for the Workbench engine, in another (future) commit, we might even consider flagging that engine `RE_USE_PREVIEW` as well (see comments in the PR)? Pull Request: https://projects.blender.org/blender/blender/pulls/136824
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