Straightening edges can introduce new edge crossings

See picture below, the area in the purple circle:

I inserted the following Mermaid code in the playground:

```
flowchart
d2e2("Test1
JavaListener"):::normal
d2e12("InputValidator"):::normal
d2e73("resolveError
Text2XmlPipe"):::errorOutline
d2e17ERROR("OutputWrapper"):::normal
d2e12ERROR("OutputValidator"):::normal
d2e7("error"):::normal
d2e17EXIT("OutputWrapper"):::normal
d2e12EXIT("OutputValidator"):::normal
d2e6("success"):::normal
d2e16("InputWrapper"):::normal
d2e18("TestXmlIfWithForwards
XmlIf"):::normal
d2e24("TestXmlIfWithAttributes
XmlIf"):::normal
d2e32("TestXmlSwitchWithForwards
XmlSwitch"):::normal
d2e61("TestCompareInteger
CompareIntegerPipe"):::normal
d2e38("TestXmlSwitchWithAttributes
XmlSwitch"):::normal
d2e26("TestXmlIfWithBoth
XmlIf"):::normal
d2e40("TestXmlSwitchWithBoth
XmlSwitch"):::normal
d2e47("TestXmlSwitchWithNone
XmlSwitch"):::normal
d2e49("TestCompareString
TestCompareString"):::normal
classDef normal fill:#fff,stroke-width:4px,stroke:#8bc34a;
classDef errorOutline fill:#fff,stroke-width:4px,stroke:#ec4758;
d2e2 --> |success| d2e12
d2e12 --> |exception| d2e73
d2e12 --> |success| d2e16
d2e73 --> |exception| d2e17ERROR
d2e73 --> |success| d2e17EXIT
d2e17ERROR --> |success| d2e12ERROR
d2e12ERROR --> |exception| d2e73
d2e12ERROR --> |success
ERROR| d2e7
d2e17EXIT --> |success| d2e12EXIT
d2e12EXIT --> |exception| d2e73
d2e12EXIT --> |success
EXIT| d2e6
d2e16 --> |success| d2e18
d2e18 --> |then| d2e24
d2e18 --> |else| d2e26
d2e24 --> |then| d2e32
d2e24 --> |else| d2e38
d2e32 --> |option1| d2e61
d2e32 --> |option2| d2e17EXIT
d2e32 --> |exception| d2e17ERROR
d2e61 --> |lessthan
greaterthan
equals
success| d2e17EXIT
d2e38 --> |exception
notFoundForwardName| d2e17ERROR
d2e38 --> |emptyForwardName| d2e61
d2e26 --> |then| d2e40
d2e26 --> |else| d2e49
d2e40 --> |option1| d2e17EXIT
d2e40 --> |option2| d2e47
d2e40 --> |exception
emptyForwardName| d2e17ERROR
d2e40 --> |notFoundForwardName| d2e49
d2e47 --> |exception| d2e17ERROR
d2e49 --> |lessthan
greaterthan
equals
success| d2e17EXIT
d2e49 --> |exception| d2e17ERROR
linkStyle 0,2,5,7,8,10,11,12,13,14,15,16,17,19,20,21,22,25,26,27,28,29,30,32,33,35,36,37,38 stroke:#8bc34a,stroke-width:3px,fill:none;
linkStyle 1,3,4,6,9,18,23,24,31,34,39 stroke:#ec4758,stroke-width:3px,fill:none;
```

Then I used the buttons shown below to reduce the number of crossings:

This is similar to minimizing the number of crossings automatically, but that algorithm makes arbitrary choices. The first picture of this issue was obtained by making different choices that could have been used by the algorithm. After placing the nodes and the intermediate nodes, the edges make many bends because the intermediate nodes are not placed on a straight line. The algorithm then tries to remove intermediate nodes and draw straight lines between the remaining (intermediate) nodes. You see that an extra crossing was produced by this process.