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aiongg
f06f11b52f
A frame that doesn't wait for images queues the work (reading a linked file, rewriting a PDF with layers hidden, measuring a Bounding Box crop, finding an image's tone) on a background thread and draws a stand-in: decodes cached under a layer variant's key, else the loading box. Each checks images::unavailable first, so a missing or modified link is read once until the links change, and loads happen outside the caches' locks. Kept layer variants have a 256 MiB byte budget besides the count limit.