fix: combo edge with uncorrect end points; fix: combo polyline edge with wrong path; fix: getViewCenter with padding problem. closes: #1817, #1809, #1775.
fix: combo edge with uncorrect end points; fix: combo polyline edge with wrong path; fix: getViewCenter with padding problem. closes: #1817, #1809, #1775.

antvis/g6,antvis/g6