in Canvas::window_to_canvas(), if either x or y coordinate is less than zero, search for the scroll group on the relevant edge.
If we don't do this then we find no scroll group covering the event coordinate, and the translation for scroll fails to be applied
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@ -231,8 +231,21 @@ Canvas::window_to_canvas (Duple const & d) const
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std::list<Item*> const& root_children (_root.items());
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ScrollGroup* sg = 0;
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/* if the coordinates are negative, clamp to zero and find the item
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* that covers that "edge" position.
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*/
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Duple in_window (d);
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if (in_window.x < 0) {
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in_window.x = 0;
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}
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if (in_window.y < 0) {
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in_window.y = 0;
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}
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for (std::list<Item*>::const_iterator i = root_children.begin(); i != root_children.end(); ++i) {
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if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (d)) {
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if (((sg = dynamic_cast<ScrollGroup*>(*i)) != 0) && sg->covers_window (in_window)) {
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break;
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}
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}
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