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Ell authored
GimpPaintCore operates indipendently of a display, and hence needs to be explictly told when operating in "show all" mode, affecting the result of paint tools operating in "sample merged" mode. Add gimp_paint_core_set_show_all() for that purpose, and call it, passing the current display's "show all" mode, in GimpPaintTool. This controls which pickable (the image itself, or its projection) is used as the sampling source, as per GimpPaintCore::saved_proj_buffer, and as returned by the new gimp_paint_core_get_image_pickable() function.
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