flutter run should have a --dtd-uri option for IDEs to pass to avoid spawning additional (disconnected) DTD instances #177329
Description
Noted at #176655 (comment)...
Currently flutter run seems to always spawn its own copy of DTD because the IDEs don't/can't pass the one they've already started.
To avoid additional processes and to ensure things can all communicate together, we need to keep them using the same DTD instance.
cc @bkonyi