please add `#region` etc to outline

[heartacker]

• vscode outline

• codemaid in VS2022
  

[PavelCibulka]

Regions and Local Functions are much needed in outline. For Regions we can take inspiration in "Outline Map" extension:
https://marketplace.visualstudio.com/items?itemName=Gerrnperl.outline-map

[PavelCibulka]

I've been thinking about this. It would need:

• Check that start and end of region is on same level in hierarchy
• Display region as "1 line size" if not correctly matched to end region
• set DocumentSymbol as Module (SymbolKind.Region does not exists): Kind = SymbolKind.Module, Detail = "region"

I also tried using Copilot to generate the code for this:

csharp-regions.cs

@dibarbet what do you think?

[dibarbet]

That is roughly on the right track, but the changes need to go a bit deeper. The DocumentSymbolsHandler probably needs to have a bit of a re-write to better handle this and related scenarios

Currently it uses the Roslyn navbar service to generate items, but it is a bit of a misuse. The navbar service was originally designed for the VS navbar, which has an entirely different expected structure from the VSCode outline. Instead, for hierarchical symbols we likely should implement a separate syntax tree walker that can create document symbols that better match the actual structure of the document. But that walker will need to handle everything (not just regions).