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Jehan authored
Allow guides with off-canvas position since we can now view and work outside the canvas. The guide deletion interaction does not change too much, except you don't delete a guide because it's dropped off-canvas but off the display viewport area instead. The XCF format is technically unchanged as PROP_GUIDES was already expecting an int32 coordinate (with max value at GIMP_MAX_IMAGE_SIZE, way below uint32 max anyway). Yet our code and XCF docs was explicitly asking to ignore negative coordinate guides, which makes a change in behavior for the XCF parser, hence a new version XCF 15. Loading will still ignore negative position guides (even also bigger than image dimension guides now) for XCF 14 and below, but will now accept any position for XCF 15 and above.
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