All these ascii diagramming tools look very promising. I just shudder to edit a diagram, though, and, say, move a box a bit to the left... How are these diagrams not write-once edit-never?

I'd like to be storing design docs and specs in git instead of confluence with draw.io diagrams, but so far haven't found any WYSIWYG round-trip-able integrated-into-intellij tools.

Intellij supports plantuml and doubtless a few other schemes, but do any of them have the equiv of a draw.io editor integrated?