Add slots to graph

[mtsr]

I've added slots to the graph. Your dot code was clean enough that I didn't want to add a dependency for that. But the itertools thing is really useful to have. Take a look and let me know what you think.

[mtsr]

This is what it looks like now (note that this is not the base rendergraph, but from my project):

[jakobhellermann]

Thank you very much. I've suggested a few minor tweaks, but otherwise this is good to merge.

[mtsr]

Made your proposed changes. This is how it looks now:

[mtsr]

Note the minor layout issues with the text flowing outside the nodes. I found this issue rust-lang/rust#76500 . If I understand correctly the graphviz engine doesn't have Roboto so is failing to set the width correctly in the SVG, which is then rendered like this (by GIMP in my case).

The proposed solution is listing multiple fonts.

[jakobhellermann]

Thanks! Can you try if fontname="Roboto, Serif" or something like that works?

[mtsr]

Doesn't seem to work. Not sure, but can't find good documentation about it, either.