Test: Settings editor default override indicator

[rzhao271]

Refs: #137943

• anyOS @jrieken
• anyOS @meganrogge

Complexity: 2

Create Issue

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1. Create a new extension that contributes a configurationDefaults. An example is at https://code.visualstudio.com/api/references/contribution-points#contributes.configurationDefaults, but don't make the override language-specific, because language overrides aren't displayed properly in the Settings editor yet. An alternative to creating a new extension is to update an existing extension to add a configurationDefaults contribution. Note that the contribution only affects the package.json file, and no changes need to be made in TypeScript files.
2. Run the extension, and look for the overridden setting in the Settings editor.
3. For that setting, the Settings editor should have an indicator showing the default value was overridden by an extension.

Something else to check is whether the behaviour of the override indicator makes sense when switching between the User and Workspace scopes. An example setting that is modifiable on both scopes is emmet.excludeLanguages: string[].