7e99e575a4
Mitigates #93726. With this asset previews will no longer flicker in the asset browser on actions like undo, redo or when using "Adjust Last Operation" if the asset library doesn't contain assets from the current file. Previews of assets from the current file would have to be cleared on undo & redo, because their memory location can change then. However the file browser's data model didn't allow clearing just these previews, so previews from external assets would have to be reloaded from disk too, causing the flickering. Noticed we can trivially skip clearing of previews if there are no assets from the current file anyway. This mitigates the issue quite a bit until preview handling is rewritten, see #122439.
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