如何避免箭头伸入箱子？

Question

我用点创建SVG输出。当我为节点和边设置penwidth = 2时，箭头略微指向框内。有办法避免这种情况吗？也许通过在边缘之后绘制节点？或者通过将边缘/箭头的长度减少到95％？我试图找到一个允许这个的属性，但找不到有用的东西。

注意：转换为png或jpg时无法看到效果。使用dot -Tsvg file.dot > file.svg创建SVG并在浏览器中查看。

这是我的点文件：

digraph configure {

  node [
    shape     = box,
    fontname  = "Courier",
    style     = "filled",
    fillcolor = "#cccccc",
    penwidth  = 2
  ];

  A [label = "configure.in"];
  B [label = "autoconf\nGNU m4", fillcolor = ".7 .3 1.0"];
  C [label = "configure"];
  X [label = "cfg.hin", fillcolor = "#eeeeee"];
  Y [label = "cfg.h", fillcolor = "#eeeeee"];

  edge [
    fontname  = "Palatino-Italic",
    fontsize  = 9,
    penwidth  = 2,
    arrowsize = 1
  ];

  A -> B [label = "  is input to"];
  B -> C [label = "  creates"];

  subgraph cfg {
    rank = same;
    rankdir = LR;
    X -> C [label = "is input to  "];
    C -> Y [label = "creates  "];
  }
}