[23_29] 绘图模式下的数组越界问题

[MoonL79]

画椭圆的情况下出现的比较频繁

可能的原因是ellipse_rep::get_control_points里abs长度是2, 但是返回的N (points)长度是3.
导致curve_box_rep::graphical_select里np是3,
457行 double t= c->find_closest_point (abs[i], abs[(i + 1) % np], p, PIXEL, b); i 取1时
访问abs就会越界了. 如果abs[2]表示成一个很大的浮点数, 那curvet_closest_points里的循环就一直卡在那了

[Shubham-py404]

Hi, I saw PR #2948 was closed because it was a hardcoded fix. I'd like to work on this and implement the 'safety net' approach GatsbyUSTC suggested, preventing out-of-bounds access across the board. Is it okay if I take this up?

[da-liii]

应该被这个修复了 #3048