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The Image Trace panel had no way to compare a trace with its source image except changing View and changing it back. The panel now has an eye button to the right of View, enabled with an Image Trace object selected. While it is held down, the canvas draws the selected Image Trace objects with their source image, whatever their View, and draws their View again on release. The document, its View and the undo history are unchanged. The renderer takes the objects in RenderOptions::trace_source, which is also part of the canvas frame key and the raster-effect cache key.