Add completions for #disable-diagnostics and #restore-diagnostics

[jeskew]

This PR adds keyword completions for disable-diagnostics and restore-diagnostics following a # sign. It also adds completions for the trailing error codes for these pragmas using the following rules:

• If offering completions for #disable-diagnostics |, the completion provider returns the codes for all suppressible diagnostics that are raised after the cursor
• If offering completions for #restore-diagnostics |, the provider returns all codes that are suppressed at the cursor
• Completions for #restore-diagnostics do not include code from the preceding line's #disable-next-line directive (if any)

The diagnostic code completions are reactive rather than proactive, so we may need to revisit the first rule in the future if users are more often adding directives to files before adding any code that may raise those diagnostics.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 21522770437)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 21522770437

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 21522770437"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 21522770437

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 21522770437"

[Copilot]

Pull request overview

This PR adds IntelliSense completions for #disable-diagnostics and #restore-diagnostics pragmas in Bicep files. Previously, only #disable-next-line had completion support. The implementation provides reactive completions based on existing diagnostics in the file.

Changes:

• Added keyword completions for #disable-diagnostics and #restore-diagnostics after typing #
• Added diagnostic code completions for #disable-diagnostics (suggesting suppressible diagnostics that occur after the cursor)
• Added diagnostic code completions for #restore-diagnostics (suggesting codes currently disabled at the cursor, excluding codes from preceding #disable-next-line directives)

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Bicep.LangServer/Completions/BicepCompletionProvider.cs	Refactored directive completion method to support all three pragma types; added completion methods for disable and restore diagnostic codes
src/Bicep.LangServer/Completions/BicepCompletionContextKind.cs	Renamed enum value to be more generic (DirectiveStart) and added two new context kinds for the new directive code completions
src/Bicep.LangServer/Completions/BicepCompletionContext.cs	Updated context detection logic to identify all three pragma types using switch expressions
src/Bicep.Core/Diagnostics/DisabledDiagnosticsCache.cs	Added helper method to retrieve all diagnostic codes disabled at a given position
src/Bicep.LangServer.IntegrationTests/CompletionTests.cs	Added comprehensive tests for the new completion functionality covering various scenarios

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