Feature/Add node spacing to flowchart configuration

[GDFaber]

📑 Summary

Added nodeSpacing and rankSpacing to flowchart configuration settings.

Resolves #1152

📏 Design Decisions

Set dagre parameters nodesep and ranksep when calling setGraph() in the flowchart renderer.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added unit/e2e tests (if appropriate)
• 🔖 targeted develop branch

[knsv]

Great! I like that you can override the default value via config. What if we also add a way of setting this in the actual graph definition.

[GDFaber]

I think that's a good idea. The values could then be set for separete graphs as well.
For instance, it could be something like this:

Current usage:

1. apply config settings if they were used
2. otherwise use default values

graph LR 
...

Additional settings in graph definition:

1. apply settings from definition if they were used
2. apply configuration settings if they were used
3. otherwise use default values

graph LR
spacing 100,40 // sets nodesep to 100 and ranksep to 40
...

Optional: short notation

graph LR
spacing 75 // sets both nodesep and ranksep to 75
...

[sionzee]

@knsv, @GDFaber
Any plans to integrate the spacing into the graph definition? It will be really useful. 👍

[GDFaber]

Hi @sionzeecz, I completely forgot to add an issue for this extension. Thank you for reminding me.