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Hans Breuer authored
VDX 'Rounding' is basically the same as Dia corner_radius, so draw_rounded_rect() was really easy to implement. While at it remove all superfluous prototypes instead of adding a new one. The import has to be a little more elaborated, because corner_radius can only be handled with "Standard - Box", but VDX has no rectangle. So we check the polygon for being rectangular and if so apply the rounding. Checked with ellipse.dia round-trip as well as with Visio Viewer 2010. Also included some minor line style/caps tweaking.
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