- Refactor configuration services to read settings from multiple folders
- Implement merging strategy for multi root workspace settings
- Implement a configuration model that can be reused across layers
- Implement getRoot API in workspace context service

Fixes Microsoft/vscode-internalbacklog#40

The unsaved (dot) indicator doesn't update when file is opened from the source code diff section (fixes #28515)

Fixes #28542: Set indent guides and cursors width with values that maximize the likelihood that all are rendered with equal screen width

Fixes #9634: Set rulers width with a value that maximizez the likelihood that all rulers are rendered with equal screen width