Fixes#6250
With this change, I've also slightly refactored the graph editor component by grouping related functionality into neat block and moving already loosely coupled groups to separate files. Further work will be needed to simplify it, but it is a good first step.
https://github.com/enso-org/enso/assets/919491/fedce111-ea79-463f-a543-da3ecce28bf5
Fixes#9357
The main issue was the spread operator using at the wrong place in functions overriding spacing of nodes. The bug, to be visible, required copying AST node before, because during copying `whitespace` field was explicitly set to undefined (in opposite to being unset), what in turns make spread overriding the value set by those functions.
# Important Notes
* To enable VSCode debugging, added a workspace for vitest and fix any relative path to be working-dir independent.
- Fix the UI problems with our CodeMirror integration (Fixed view stability; Fixed a focus bug; Fixed errors caused by diagnostics range exceptions; Fixed linter invalidation--see https://discuss.codemirror.net/t/problem-trying-to-force-linting/5823; Implemented edit-coalescing for performance).
- Introduce an algorithm for applying text edits to an AST. Compared to the GUI1 approach, the new algorithm supports deeper identity-stability for expressions (which is important for subexpression metadata and Y.Js sync), as well as reordered-subtree identification.
- Enable the code editor.
When using `npm run lint`, there are a lot of warnings for the last couple of weeks, and it is really annoying because I keep skipping important warnings for my files.
- Synchronize Y.Js clients by AST (implements #8237).
- Before committing an edit, insert any parentheses-nodes needed for the concrete syntax to reflect tree structure (fixes#8884).
- Move `externalId` and all node metadata into a Y.Map owned by each `Ast`. This allows including metadata changes in an edit, enables Y.Js merging of changes to different metadata fields, and will enable the use of Y.Js objects in metadata. (Implements #8804.)
### Important Notes
- Metadata is now set and retrieved through accessors on the `Ast` objects.
- Since some metadata edits need to take effect in real time (e.g. node dragging), new lower-overhead APIs (`commitDirect`, `skipTreeRepair`) are provided for careful use in certain cases.
- The client is now bundled as ESM.
- The build script cleans up git-untracked generated files in an outdated location, which fixes lint errors related to `src/generated` that may occur when switching branches.
