Parser/editor missing support for concatenated strings

[ferdnyc]

Another bit of stealth syntax that both Pydot and the GVE lack support for¹, quoting from the GraphViz language documentation, in the "Comments and optional formatting" section):

In addition, double-quoted strings can be concatenated using a '+' operator.

I have never ever seen anyone actually use that syntax, but I tested and it does work in dot. This graph will contain a red node named "MyConcatenatedNode":

graph G {
    "My" + "Concatenated" + "Node" [color=red];
}

Just thought I'd get it officially on the "board". No urgency implied or expected.

Notes

1. (I typically use the GVE as my barometer for how much demand there's likely to be for support, when encountering a parser omission. If it works in the GVE but not Pydot, we probably need it. If neither support it, meh, it's obscure and low-priority. Not scientific, but it's served me so far!)