fix: clear closed editor file context

[nanookclaw]

Summary

Fixes #277.

When an editor closes, ReferencedFileService now checks whether the closed editor is the file currently represented in Copilot Chat. If it is, the service clears both the current-file observable and current-selection observable immediately. This keeps the existing fallback behavior for the final-editor-close case, but no longer depends only on the workbench editor reference count, which can still include an editor while focus has moved to a non-editor view.

The regression test captures the part listener registered by ReferencedFileService, seeds the current file observable, simulates closing that same editor while another editor reference is still reported by the active page, and asserts the chat current file is cleared.

Testing

• git diff --check
• ./mvnw -pl com.microsoft.copilot.eclipse.terminal.api,com.microsoft.copilot.eclipse.core,com.microsoft.copilot.eclipse.ui,com.microsoft.copilot.eclipse.ui.test -am -Dtest=ReferencedFileServiceTest test

I also tried the same module set with verify, but it stops in packaging because com.microsoft.copilot.eclipse.core/build.properties expects copilot-agent/dist/, which is not present in this checkout.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Refactors ReferencedFileService editor-close handling to clear the “current referenced file” more reliably, and adds a unit test covering the new behavior.

Changes:

• Update partClosed logic to clear the current referenced file when either the current file is closed or there are no open editors.
• Extract helper methods (isCurrentReferencedFile, hasNoOpenEditors, clearCurrentReferencedFile) for reuse and readability.
• Add a JUnit/Mockito test validating that closing the current referenced file clears service state.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/chat/services/ReferencedFileService.java	Refactors close-handling and adds helper methods to decide when to clear current referenced file/selection.
com.microsoft.copilot.eclipse.ui.test/src/com/microsoft/copilot/eclipse/ui/chat/services/ReferencedFileServiceTest.java	Adds a regression test for clearing current file when the closed editor matches the current referenced file.

[jdneo]

Hi @nanookclaw

Thank you for your contribution, there are some copilot review comments, could you first check if they are valid?

[nanookclaw]

Checked the Copilot review comments and they were valid. I pushed 122edf0 with the fixes:

• Resolve the closed-editor false negative by reading the file from IEditorReference.getEditorInput() before falling back to the editor part.
• Avoid active-page-only clearing by checking editor references across all workbench windows/pages.
• Replace the test reflection against currentFileObservable with a small protected test seam and local test subclass.

Verification:

• git diff --check
• ./mvnw -pl com.microsoft.copilot.eclipse.core,com.microsoft.copilot.eclipse.terminal.api,com.microsoft.copilot.eclipse.ui,com.microsoft.copilot.eclipse.ui.test -Dtest=ReferencedFileServiceTest test

[jdneo]

Thank you. Please mark those comments as resolved once you addressed them