1f88645728
Show a dimmed loading icon while previews are being loaded in a background thread. The asset shelf and asset/file browsers do this similarly already. This is implemented in drawing code, so the loading icon will always appear when an in-progress preview is being drawn. I experimented with doing this in `ui_def_but_icon()`, but this won't update correctly with popups that don't support full refreshing. This also makes any normal icon that is drawn as preview use the normal icon size. These icons are usually made for smaller sizes and look very outblown when displayed at the size of a preview. Yet it's useful to sometimes pass a normal icon. E.g. for the asset shelf we would already draw the data-block type icon in place of the preview if there was no preview to display, and we'd use the normal, smaller size already. Larger can still be drawn differently. I don't know of any current cases this would affect though. Pull Request: https://projects.blender.org/blender/blender/pulls/133880
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