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object PortNudger

Nudge edge ports to avoid overlapping vertical edge segments.

If an edge starts at the same column as another edge finishes, there is a risk they could be drawn overlapping. This avoids the issue by moving the in port one column away (and we make the assumption that there is space for that).

╭─────╮ ╭─────╮ ╭─────╮ ╭─────╮ │ A │ │ B │ │ A │ │ B │ ╰─┬─┬─╯ ╰─┬─┬─╯ ╰─┬─┬─╯ ╰─┬─┬─╯ │ │ │ │ │ │ │ │ │ ╰─────┼ │ vs │ ╰─────┼╮│ │ ╭─────╯ │ │ ╭────╯││ │ │ │ │ │ │ ││ v v v v v v vv ╭─────╮ ╭─────╮ ╭─────╮ ╭─────╮ │ X │ │ Y │ │ X │ │ Y │ ╰─────╯ ╰─────╯ ╰─────╯ ╰─────╯

Some of the overlaps can be avoided by ordering the edge rows, but not if the overlaps cause a cycle, as in the case above. Ideally, we would just nudge just enough vertices to break the cycle, and let edge ordering handle the rest, but at the moment we nudge everything.

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