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A raster export compared the process-wide count of images that could not be decoded before and after it drew, and warned that "an image couldn't be decoded and is missing from the picture" when the count rose. Any other thread that failed to decode an image in that time raised the count too: a second export, the UI thread drawing the canvas, or the canvas, thumbnail and placed-document workers drawing a document with such an image. The export then warned about an image it does not contain. In the engine's tests, options_not_applied_yet_and_document_features_warn failed in 5 of 60 runs of the tests_raster and tests_pdf* tests. The count is now kept per thread. An export reads it on the thread it draws on. That thread decodes every image the export draws that is not already in the shared image store, and an image that failed to decode is never stored.