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Ell authored
This commit adds support for moving together an intersecting pair of guides using the Move tool, by dragging the guides at their point of intersection. This is useful when the guides are used to mark a point, rather than a pair of lines (e.g., as is the case for the mandala symmetry guides, which mark the symmetry's point of origin). Add gimp_image_pick_guides(), which can return a set of guides, rather than a single guide. The API allows an arbitrary set of guides to be returned, but, in practice, at most two intersecting guides are returned, as per the above. In GimpMoveTool and GimpGuideTool, add support for moving multiple guides together, and, in GimpMoveTool, use gimp_image_pick_guides() to potentially pick multiple guides.
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