Disable markdown option when JSON or XML is detected in TextVisualizerDialog

[Copilot]

Description

When the TextVisualizerDialog detects content as JSON or XML, the markdown format option remains enabled in the format selector despite being nonsensical for structured data. This refactors OnParametersSet so that markdown is only added to EnabledOptions when no structured format (JSON/XML) is detected, rather than always enabling it upfront. Markdown can't be reliably detected from content, so it is enabled when the format is unknown to let users switch to markdown rendering if they want.

• TextVisualizerDialog.razor.cs: Only add MarkdownFormat to EnabledOptions in the else branch when neither JSON nor XML is auto-detected, with a comment explaining the rationale
• TextVisualizerDialogTests.cs: Update assertions to expect markdown excluded from enabled options for JSON/XML content

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No

[JamesNK]

@copilot Refactor so DashboardUIHelpers.MarkdownFormat isn't always enabled. Enable it when nothing else matches.

[JamesNK]

@copilot Include a comment that it isn't possible to reliably detect markdown so enable when content is unknown so folks can switch to it if they want.

[Copilot]

@copilot Refactor so DashboardUIHelpers.MarkdownFormat isn't always enabled. Enable it when nothing else matches.

Refactored in the latest commit. Markdown is no longer added upfront — it's only enabled in the else branch when neither JSON nor XML is detected.

[Copilot]

@copilot Include a comment that it isn't possible to reliably detect markdown so enable when content is unknown so folks can switch to it if they want.

Added in commit Add comment explaining why markdown is enabled for unknown content.

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17970

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17970"

[Copilot]

Pull request overview

This pull request updates the Aspire Dashboard’s TextVisualizerDialog so the Markdown format option is only enabled when the content format is unknown, and is disabled when the content is auto-detected as JSON or XML (where Markdown rendering is not meaningful).

Changes:

• Refactored OnParametersSet() to only enable Markdown when neither JSON nor XML is detected.
• Updated component tests to assert Markdown is excluded from enabled options for JSON/XML inputs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Aspire.Dashboard/Components/Dialogs/TextVisualizerDialog.razor.cs	Adjusts enabled format options so Markdown is not enabled when JSON/XML is auto-detected.
tests/Aspire.Dashboard.Components.Tests/Controls/TextVisualizerDialogTests.cs	Updates assertions to match the new enabled-options behavior for JSON and XML inputs.

[github-actions]

❓ CLI E2E Tests unknown — 110 passed, 0 failed, 3 unknown (commit 08cb563)

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