fix: expand non-Java workspace roots when resources are shown

[wenyt (wenytang-ms)]

Summary

• Expand workspace roots with no JDT projects from the filesystem when java.project.explorer.showNonJavaResources is enabled.
• Keep the existing JDT-backed project hierarchy unchanged for workspace roots that already contain projects.
• Apply files.exclude to filesystem-backed resources and keep those resources out of APIs that return Java project nodes.
• Expose filesystem-backed resources as browse-only nodes instead of enabling mutation actions that require project watchers.
• Extend the multi-root integration and AutoTest coverage added by fix: hide non-Java workspace roots when resources are hidden #1074.

Scope

This is the minimal Show counterpart to #1074. It makes filesystem-only roots expandable without merging ordinary filesystem resources into workspace roots that already contain JDT projects. Fallback resources can be browsed and opened, while mutation actions and automatic refresh for external filesystem changes remain outside this PR.

UI verification

Before: Hide

With Hide Non-Java Resources enabled, the filesystem-only non-java workspace root is not shown, while Java workspace roots remain available.

After: Show

Switching to Show Non-Java Resources restores the non-java root, which can now be expanded to browse package.json.

Validation

• npx tsc -p . --noEmit
• npm run tslint
• npm run compile
• JDT LS bundle build and VSIX packaging
• Targeted multiple-suite: 4 passing
• AutoTest 0.7.25 — Project Explorer: 48/48 passing

Fixes #758

[Copilot]

🟡 Changes recommended

Conditional exclusions and resource actions are incorrect for supported filesystem configurations.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds filesystem browsing for non-Java roots in multi-root workspaces.

Changes:

• Adds filesystem-backed explorer nodes with exclusion filtering.
• Keeps Java project APIs limited to ProjectNode.
• Extends tests, documentation, and localization.

File summaries

File	Description
src/views/workspaceResourceFolderNode.ts	Implements filesystem resource nodes.
src/views/workspaceNode.ts	Loads resources for non-Java roots.
src/views/dependencyDataProvider.ts	Filters root project results.
test/multiple-suite/projectView.test.ts	Tests resources and exclusions.
test/e2e-plans/java-dep-project-explorer.yaml	Verifies expandable non-Java roots.
README.md	Documents browsing behavior.
package.nls.json	Updates English setting text.
package.nls.zh-cn.json	Updates Simplified Chinese text.
package.nls.zh-tw.json	Updates Traditional Chinese text.

Review details

• Files reviewed: 9/9 changed files
• Comments generated: 2
• Review effort level: Balanced

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[Copilot]

🟡 Changes recommended

Mutations in filesystem-only roots leave the tree stale because those roots are not watched for refreshes.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Review details

• Files reviewed: 9/9 changed files
• Comments generated: 1
• Review effort level: Balanced

[Copilot]

🟢 Approval recommended

The implementation matches the stated scope and includes appropriate integration and deterministic UI coverage.

Review details

• Files reviewed: 12/12 changed files
• Comments generated: 0 new
• Review effort level: Balanced